The type of trailer connector you'll find will vary. There are three possible types, 4 pin, 6 pin, 7 pin. The 7 pin is the newer standard. I just installed a connector on my 4Runner, and it has both a 4 pin and 7 pin. I purchased it and a brake controller kit from etrailer, I would recommend them.
To answer your question specifically, most Jaycos with electric brakes came with 6 pin connectors until recently when they switched to 7 pin. My trailer originally (2002) came with a 6 pin, but a previous owner mutilated it into a 4 pin. I switched it out for a 7 pin, but still need to do more wiring to get the brakes working properly.
My advice is to put the 4/7 pin connector on your tow vehicle, and convert your camper to 7 pin. The only trick is if the camper has a 6 pin when you purchase.. you will want to inquire with the seller and perhaps secure an adapter to tow it home.
1995 Toyota 4Runner SR5 4WD 5 spd
2002 Eagle Summit 12