I had a 2005 Silverado that I towed behind a Newmar Essex and a Millennium Prevost. I had a Rampage lift mounted in the Silverado and used that for my Harley Electraglide. I worked, but it was scary at times. Most of the time. It wasn't stable coming up into the truck. I had a trained installer put it in the bed and it almost fell over the first time the bike came up.
I sold the Rampage and bought a Cruisercaddie, which was approx. $1000 less then the Rampage and it works great. It's all aluminum and is in 4 lightweight pieces. So when we go to Florida in the winter I can take it out of the truck. The Rampage weighed so much it stayed in the bed all winter at the rv park.
I don't know what your questions are but I've tried everything to carry motorcycles.
06 Millennium Prevost
15 HD Limited Low and 16 HD Triglide (DW)
13 Avalanche Black Diamond with Cruiser Caddie