Adouty,
There are number of bunkhouse models that will probably work for you. Perhaps the first thing you should do is load up the wife and kids into the truck and go get it weighed. Your actual truck weight along with the information available from "Trailer Life" will tell you how much trailer weight you can handle, both in term of Gross Combined Vehicle Weight and the how much tongue weight you can still carry. Expect to add close to 1000 lbs or more to a trailers "dry weight" by the time you add food, water, blankets, cookware , etc, etc. If you find a trailer you like, it would be a good idea to get an actual trailer weight if possible before you purchase it. There are a lot of great models out there, take you time to lookaround.
Jake