The most logical place for the Harley would be in the pick-up box, so a HD 3/4 ton TV would be my recommendation, thus providing adequate "payload capacity" (including TT tongue weight, cargo, etc.).
A couple years ago I looked into loading my HD Road King into my 2500HD, plus tow my TT at the same time. I did confirm that with "my" TV/TT combination I would max out my TV's payload and GCWR..., but in my case I have a heavy TT, heavy TT tongue, heavy Harley (900lbs), and I also had to consider the auto/ramp weight.
This is the auto/ramp I was considering:
http://www.blueox.us/p-51-overbilt-sportloader.aspx
I nixed the Harley idea..., and now looking into a Kawasaki KLR 650 to take along (half the weight, easier to load manually).
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)