How about something like
this.I would not obsess about the weight too much as you should be fine with a moderate sized trailer; the wheels won't fall off at one pound overweight or one inch too long despite what some people assume. The setup and the trailer itself can be as important as the weight or length in a moderate sized trailer, and setup you do need to pay attention to. If you are not experienced then get someone who knows, and you may even need to do minor mods to the truck for best results (some SUVs don't transfer weight well unless there is a braces added on, and you will need solid weight distribution with all those people). The best person to setup may not be the same person as sells you the trailer, a lot of places don't know anything more than looking up a tow guide.
There are other models similar to this one too so look around but this one I remember the name. That is a lot of beds you are looking for in a moderate sized trailer, there was one models I saw that had 4 plus couch (with bunks) but memory is failing me on the name rigth now.
