Ok Merc, then we both can be the "been there, done that" guys !!!! Wish your business was a bit closer, I could come around kick tires and we could compare war stories !!!!! I worked in a dealership once......never again. No way I would want your job!! Too many headaches for me...

Anyway, Pat had some good ideas for you in the post above, if you want, take a look in my gallery and you can see my answer to a Merc frame with air ride. Good luck with your project, let me know if you have any problems locating a suspension package for the Merc and I will do some checking for you.