Thank you, all, for your comments. The answer I got from Newmar was, "I wouldn't recommend it", when I asked about the bike, the car, and the tow dolly. They (naturally) suggested a longer rig with tandem axles.
I agree with the flat tow, but it looks like the best - if not only - solution is a tandem axle that can support the bike/lift weight, and flat-towing a 4WD. But just bought my rig, and longer than I initially planned, so, the HD will have to stay home, or get towed behind the car. I can live with it... was just thinkin'...
I knew about the Rampage Lift, may consider that, if the GCWR will support it, but not hopeful...