That would be quite a job IMO. If you're planning on using it to support part of the weight, it would have to also be able to move up and down with the rear of the unit. And that could be a pretty large amount of movement considering some dips in the road and driveways and such.
My opinion is you have three choices:
1. Get a smaller/lighter bike.
2. Get a toyhauler.
3. Get something like a Smart Trailer or a Swivelwheel trailer.
The add-on trailers are the cheapest solution, but have their own issues:
Added length, added tail swing, not legal in all states, needs a strong/well built receiver hitch.
You could also just pull a small trailer for the bike, but then you run into the issues of backing up. Not a fun thing.