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Camper MUST be level. Bring the hitch up another inch and test again. Might need another 2 inches to be level. Single axle trailers suck and this is part of the problem, more tongue weight.

How much does camper weigh and what's the tongue weight
 

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Camper is 1400kgs unladen with a massive towball weight of 280kgs which doesn’t change when I get the 220 kgs of dirt bikes in, plus gear, fuel, genset etc. no matter what I have that 280kgs of towball weight. I am looking long term to get a dual axle toy hauler but for now this is it.
Lift the hitch another inch and see what happens
 

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Part of your problem is the hitch. That height adjustable device is moving the towball what looks like about 150mm further back, and that magnifies the already high ball weight effect on the rear axle and worsens the sag. And then there is the weight of the height adjustable hitch itself. It's also possible the towbar itself has the receiver further back than optimal. Dunno about the 7P, but the CR owners manual specifies how far back the towball should be, and the towbar itself has a placard that shows the max distance the ball can be from the pin. Might be worth seeing if the 7P has similar info.

Is it possible that your 9 year old springs are a bit soft/sagged - maybe new springs at the standard rate would be a start.

If the ball weight is not changing with loading the camper, the scales might be dodgy.

Also, presumably the bikes load over a ramp on the back of the camper and their mass is behind the camper axle? That will help reduce the ball weight and ultimately the sag that's most relevant is when the bikes are loaded ready for travel but Unfortunately any load in the car is only going to make it sag a bit more.

You might want to try it without the adjustable hitch just to see how much effect the extension and its weight has.

Unfortunately through the geometry of your camper with the axle so far back is going to make your life difficult.
Good point on hitch length. OEM hitch is like 1.5" long
 

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I would stick with bc racing or Ceika personally, if this is the road road you're wanting to take
 

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Here’s what I’ve decided on View attachment 250985


I tried BC Racing but couldn’t find any listings for Touareg at all. I didn’t know about Ceika but I rang all the usual suspension specialists and they sort of laughed when I said VW 😡

Ceika, rated extremely well over the years

Bc I forgot might not actually sell Touareg anymore you'd have to browse around
 

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My new coilovers are being fitted and hoping to get the car back today. They’ve been having difficulties with the rear ones with sketchy installation instructions. I’m having the ride height set to maximum since the lift kit won’t fit. This should give me 20mm lift which is better than nothing. I’ll be hitching up the caravan and heading up to my mates to test his Towpro brake controller on my van. I’m on another thread about that!

I’ll post pictures of the caravan hooked up with the new springs and without changing the hitch height we’ll see if it sits better with the increase in ride height and stiffer springs. Once I get the desired towball height established I’ll then look for a standard (shorter) hitch of the right height to reduce the leverage and rear axle load. It may have to be custom made.

Anyone know who makes custom hitches?
Why a custom hitch?? Just get an adjustable hitch
 

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In Australia for towing we are subject to keeping below the manufactures limits regards max rear axle load, TBM, GVM and GCM
In most cases the adjustable hitches move the ball mount point further away from the rear axle which exacerbates the issues already experienced in staying under the Touaregs 1530kg rear axle limit
[edit] also adjustable hitches are a great deal heavier than necessary this additional steel further adds to TBM which in turn adds at least 1.35 times its own weight onto the rear axle
I'm trying to understand what the custom hitch is going to accomplish here
 

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I believe current tow ball height is low for trailer, adjustable hitches a often big and heavy.
A custom hitch neck should be able to give required height with minimum weight snd rear axle offset
You can buy 2" or 3" drop hitches that are non adjustable...
 

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I’m trying to shorten the distance from rear axle to towball. The current adjustable hitch is at least 140mm longer than standard and all adjustable hitches seem to be longer. I’ve seen hitch tongues that are 2” or 4” higher from max hitch and mr hitches. If that is close then they will do the job. View attachment 251225

This is what I have which is very long

View attachment 251226
Ahhh, I see. The OEM Touareg hitch is what you need. It's at least half as long as most aftermarket.
 
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Just depends on the height. Do you know the height of the OEM hitch?
It's at the exact height OEM calls for. Can't remember off memory, 23.x" off the ground maybe? 17.x"? I know, not helpful lol. You can find the OEM height in the manual
 

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Good news! My coilovers fitted finally and I’m really pleased with the result. There’s good lift and I don’t need a lift kit any more from the looks of it. It’s a firm ride but not jarring. The damping seems well suited to the spring rate.

It’s dark outside but I couldn’t wait till the morning to share my excitement. I think that’s a good lift maybe partly due to the extra 20mm height plus the heavier springs holding the shocks up a bit higher in the stroke.

Do you think that looks equivalent to a 2” lift?

Next I need some bigger tyres to fill the arches 😁

View attachment 251237
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Wow that looks more like 2-3" lift! Looks really good though
 

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The good news is that the towball is more than 50cm off the ground static (measured on my sloping driveway so it read 53cm) then once the caravan is on it is 45cm off the ground so it’s only sagging 2” or so. The caravan is an inch lower at the front than back so could go up another inch at the towball to 47.5cm to be level. It’s so little I might just leave it where it is. I’ll find a shorter tongue with the right lift on it and get rid of the Raptor. My other concern is the front still looks like it’s high compared to the back but nowhere near as bad. I might drop the front a bit. View attachment 251253
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Compared to what it was before
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Ugh single axle trailers. I would drop that ball one slot and see how it looks. It seems about 1" too high.

It 'looks' a lot better.
How does the front end/steering feel now with the new suspension?
Also, the new suspension componentry will bed in and settle over the next 5k klms or so, so your final ride height etc is still yet to be determined.
Yep
 

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What makes you say the tow ball needs to be lower? Which part looks too high? The caravan looks level or slightly down in the nose so I was thinking it needs to go up.
To me, on my little cellphone screen, the nose looks like it's facing the sky. Dropping it one inch would likely level it out
 

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Possibly if it were a twin axle trailer. Would a single axle just put more weight on the rear?
I measured the clearance between tyres and wheel arches without the trailer attached and the clearance is about 2 inches more in the front so that needs to change. Dropping the front down to the same clearance as the rear would make the body of the car look like it’s nose down. Is that how the Tregs look?
Think of it like a teeter tooter. If the weight is off you'll notice negative driving characteristics. Being parallel is ideal.
 

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Often times having the tow ball too high will cause undo tongue weight increases. You may end up dropping the front end of the Touareg but also bring the trailer to a more comfortable parallel
 
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The rear appears slightly higher, what's your fender to ground front and rear?
 

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Ground to fender 85cm rear, 84cm front, so 10mm higher at the rear or less than half an inch. Intent is to have the car not point noise up too much when towing.
With the van attached the ground to fender is 82cm rear so 20mm lower than the front or less than an inch. The car and van look pretty good now imo. Van is slightly nose down 50mm lower at front which someone here said was preferable

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Looks great to me, well done! How is the comfort of the new suspension vs stock? The handling too?
 

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That's awesome! Thank you for your findings
 

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Can you supply the exact link you used?
 

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So you've got me thinking now.

How does this suspension upgrade Make the Touareg handle without a load? Does it actually improve the ride compliance or improve the sporty handling?

Did the suspension upgrade alleviate any sagging from tongue weight?

Did the suspension upgrade overall improve the ride when towing?
 
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