Remember, I have a Bonnie. Actually mine runs very strong when it isn't towing the sidecar around. I can run with an 1800 VTX, well stay with a few bike lengths to 100 or so. Problem is, the Bonnie, just like the KLR feels like a toy compared to the Winnebago, I mean Rocket.
I had a 2004 Bonnie. It was a great bike just like my 1970 version. But it was a bit unstable on the highway with the winds we have around here. I test drove the Rocket once and that was it for the Bonnie.
My Rocket don't like gravel roads and that's what I live on. I always take it easy. Now the KLR likes gravel. I hit the gravel from the pavement and gas it in second and get it sideways. The Rocket would be in a heap with me under it. The Bonnie don't like gravel either. It must be something in the steering geometry, however, the Bonnie with the sidecar attached loves gravel. I can do doughnuts with the Bonnie/Sidecar in the gravel road.
I was able to drive both my '83 Sportster and Bonnie in desert sand. They're light enough so you can keep them upright without too much trouble. I really hate the feeling you get when the Rocket starts tipping over and there isn't a thing I can do to stop it. I've lifted it back up twice. Once drunk, no injuries but the other time I completely disjointed my sacoiliac joints on both sides. That hurt for a while.