Not to hijack the thread:
Although my build is probably on the heavier side (frame and no lack of wood structure) it's not a major concern for me as I can't ride in small vehicles due to the nature of the ride so will always tow with a crossover or or mini van.
I have seen the interiors of some big motorhomes and am in awe of the lack of concern about weight. My experience towing my utility/dump trailer is about a 15% drop in mileage when towing it on the highway (it weighs a ton empty). I expect the teardrop to be better due to the areodynamics.
Everything is a compromise but the big boys sure don't seem to be concerned with weight. I wonder if they have tested and determined that weight doesn't play that big a part after you get past a certain point?
I think there are a lot of reasons to keep the weight of a teardrop within the limits of the tow vehicle. I kinda think a granite countertop is over my line, ha. A few tile proably won't contribute that much (particularly if you leave out the wonderboard).
Cheers,
Gus