Originally Posted by CAVEboy
These are some interesting challenges. I am going to have a hard time accomplishing all of them, but will see what I can come up with. I'm a little worried about the motorcycle's frame strength and attaching the diagonal support to the rear of the bike as suggested (bikes tail sub-frame). I have a couple attachment points where I have the cargo tail rack, but the frame there is small diameter and wouldn't seem to take much of a lateral load...
We used an arm coming up from the main subframe and clamping to the smaller rear frame loop of the bike. The KLR has a reputation for a weak rear loop on the frame. This arm carries the rear mount, prevents that clamp from rotating re-enforces the rear loop of the bike frame and helps brace the bottom rear mount.