When we needed the chassis inspection in Florida I was unable to find any of the larger mechanical shops that would do it in a reasonable time at cost. I eventually found a small independent mobile diesel mechanic who could do the job and he was fantastic.
I eventually purchased a rig out here in the Vancouver BC area. The local Spartan shop wanted $450 for an inspection but 50 miles south, in Mount Vernon, WA, Valley Freightliner (also Cummins and Spartan shop) did it for $150. Check around.
Retired and livin' the RV dream!
2005 Newmar 43 ft. MADP, Cummins ISL 400HP, 2008 Honda CR-V toad