just get a 5x8 utility trailer, its simpler, easier, and will be 10 times more useful to you. on most holidays tractor supply puts the wire mesh floor ones on sale for $550 and you just screw a sheet of treated 1/2" plywood on it.
the problem with bike carriers is they max out at 500 lbs and you are at the max, is it really worth losing your bike over?
plus, with the utility trailer you have the ability to haul your lawn mower, refrigerator, freezer, washer, drier, or whatever you need to haul.
I have been riding motorcycles for 45 years and I would NEVER trust my bike on one of those flimsy carriers, they are only designed for carrying light weight dirt bikes and not street bikes, they are not easy to load your bike onto by yourself without dropping it on the ground or on your car, damaging both, and they don't hold the bike very well teetering on a 2" square bar and very little to tie it down to secure it.
just my 2 1/2 cents on this