Buyer's remorse??

It would really help you to put the family & pets in the Burb with a full gas tank and go to a scale. You may find them at waste disposal stations or truck stops. You will also need the GCVWR which is the maximum combined weight the SUV & trailer can weigh when hitched. It is often less than you might think and will definitely make your 8100 lbs a myth. For some possibilities to look at as you find those numbers, you might look at Spree, Jay Feather or Lance for some idea of what you may end up needing to consider to stay within your limits. Personally, I want access to the bathroom on the road without putting out a slide. Your exterior length on the road should be 25' or so for best handling. I would also suggest looking at used as you explore the lifestyle. Our family with 3 kids had a 17' (probably really 19') and added tents as needed. Your tastes will change in time. Have fun in your search!