If within your overall needs parameter re. the side-by-side size, see if a half or 3/4 ton truck helps bring you in comfortably under 10,000lbs.
I know many do it and will disagree, but over decades of reading about hitch modifications, I’m not a fan of that option. When manufacturers set hitch limits, they factor much more in to it than just how beefy the hitch is or how it mounts to the frame.
Consider also a duo-level trailer where you could put the toy on top and an SUV or other medium to small toad under it. Your 1 ton flatbed truck idea is nearly too much all by itself.
Joel