I'm new to the forum and could use some help. We have an 87 36' Grand Villa on an OshKosh ORED chassis. It has 73,000 miles in excellent shape. I recently had new air bags and shocks put on. My concern was the air bag rubber was nearly 30 years old I figured while the mechanic was in there we'd put in new shocks as well. The only number I could really cross to the...