The cargo capacity of my XT276 is 2,000 lbs. A Harley full dresser weighs 800 pounds, give or take a little, so you can put two Harley's in a XT and be within weight limits.
But yeah, thats a lot of weight for the way these light weight trailers are built.
2014 Fun Finder 276
2015 Ford F150 Ecoboost 4x4
2011Harley Road Glide Ultra