Dont put that much weight on the receiver. They are rated for 500 lbs pushing straight down like a trailer will do but the hitch carriers put the weight at the end of a 2 foot lever. There is an online calculator somewhere that allows you to plug in your weights and the length of the extension and wheel base and gives you the max weight a class 3 receiver can handle. When I ran mine it came to 370 lbs with an 18 in extension. I had to shorten the carrier extension rail, replaced all the class 3 hardware with grade 8 bolts, had a shop weld 1/4" 2x2 angle onto the frame extensions and put braces from the bottom of the hitch to the RV frame. And this was so I could haul a KLR 250 at 295 lbs plus the carrier. It still adds 500 lbs to the rear axle and removes 140 lbs from the front.
