My 6x12' United Trailer, I can put almost 10 models in her plus coolers. She has a 3000lb gross and I figure I'm close to that. The tongue weight is of big concern, I'm running about 420lbs. That should be ok given the 10-15%rule, the car handles well with that weight. It's pretty hard to keep the weight out of the front trailer section with cabinets and batteries. I did add my spare tire to rear roof rack to help shift a aft moment on the cg. I have a counter top area which is great for eating, fixing stuff and kids can keep busy with drawing and such on it.
Laptop with a ATT aircard gives me internet service so I can order replacement parts right after the crash. Added tons of LED AA powered lites from KMART and a extra spot lite on side. I'm running 3 deep cycle marine 12 volt batteries in paralell to a 1400watt inverter.