I have a 06 Treg with air ride and factory tow package and a 24ft Coachman trailer.when I bought it 3 yrs ago I hooked up the lights and all was fine. Now over the past year from time to time my taillights and running lights drop off and don't work. The brake lights and blinkers continue to operate though.im not really sure where to start searching?I have the prodigy P3 and it will will chime in saying "check trailer.it is rare but from time to time they will come on on and be fine .