Torn Sleeper Boot

I have a 2007 Sterling truck. It is not a high miler but I am in the process of replacing the rubber boot between the cab and the sleeper unit for the third time. The first time replacement was done at the dealer and lasted 4 months. I replaced it at that time and the replacement lasted just about a year, and now I see it is time to change it out again. I've had trucks where the boot never needed replacement but this one ....
This unit has an air ride cab and a solid block mount for the sleeper which I am assuming is causing the boot to tear. The question for the forum is this. Has anyone ever tied a sleeper and cab together to be supported by regular air cab mounts, what kind of material could be used, aluminum I beam or ...?
I am also open the possibility that I have overlooked something. Has anyone else a bad experience with torn boots? As sleeper boots go, I do prefer the kind that don't tear or fall out.

 

Hi marmonman, thanks for the input. The cab is definitely moving too much for the boot that has been supplied. I have inspected both shocks and the bags and they seem to be fine, no abrasions or leaks. Your suggestion did spur an idea though. I will try to limit the top end movement with a length of chain. Wish I had thought about that earlier.