I wouldn't worry about the layout. It is very easy to push a button and make room.
The trailer in question has a 7100lb dry weight, just like mine. However it only has a 1700lb CCC. With a family of 4 you will easily use up all that CCC. My trailer weighs 2100lbs more than the dry weight at 9200lbs for a week long trip. My trailer has an 11,200lb GVWR and a 4100lb CCC.
Oh ya and I'm towing it with a V-10 Excursion with 4.30 gears!
So there is no way your going to comfortably pull that trailer with a 1/2 ton Burb with probably a 5.3L and 3.45 gearing!
Good luck! I'de keep the trailer and upgrade to a 3/4 ton truck with more motor!