2000 Tioga, Ford chassis, tongue weight question....

You might want to consider carrying your motorcycle in a front carrier, instead.

The physics of this work out a lot better and from what I've read in the forums about carrying motorcycles in the front, there are no over-heating issues when doing this. Headlight interference may be a problem, however, if you expect to do much night driving ... not sure on this headlight issue however ... just a guess.