Carrying a motorcycle ?

850# on the rear hitch bouncing up and down going down the road. Not for me. Most MHs have a max tongue weight on the hitch of 350# even if you have one that is for 500# you have exceeded it also by over 50%. Most MHs have extended frames and are not meant to support that much weight. You are going to have to really beef up the rear frame and then you well probably going to exceed the rear axle rating. Take a look at how long the rear over hang is on a MH and then figure out how much leverage that much weight is going to add to rear end weight.

IMO not something I would do or recommend but what you do is up to you.