I agree with everyones comments about matching your trailer to the tow vehicle and finding a layout that works for you. My only advise is as you walk through these trailers, be thinking about where you will store all of the necessities you will take with you both inside and out. To me storage is as important as comfort. Also keep in mind that with a few exceptions, most of the systems in an RV including fridge, heat/air conditioning, water system, stove/oven etc are pretty much the same brands in all RV's. Again, buy the layout that suits you and your family.
Now this has made me wish I was out camping instead of sitting at this computer....Have fun!