BIG, I'm not sure if I would worry about tire repair on the road- especially the 22.5's. I would carry in the trailer what was needed to efficiently change a wheel on the road. The MH has air brakes, correct? I would put a coupler in the wet tank if it doesn't already have one.
I think the Safety Seal kit is one of the best out there. It has saved my bacon a few times.
http://www.safetyseal.com/
Our local tire shop even uses them for plugging customer tires.
The one reason we stopped where we did is because for the previous hour we had no cell service, so ya we have AAA also but when you have no way of contacting them???