I removed the rear bumper of my TT and extented the main TT frame rails by 2 or 3 feet and reattached the bumper. This gave me a nice 3x7 platform on which
I take (among other items) a dual sport bike weighing about 350 lbs.
It's also a convenient platform to carry bicycles, coolers, deck-chairs....
If you use a dedicated motorcycle ramp, check that you are not blocking your rear lights AND your licence plate (I got a ticket for an obscured lic. plate). Also check the overhang, you MAY need a red flag if the overhang is over 4ft (?).
Gerry