Rita,

If you are buying a "certified" Marathon I assume you are buying or considering a coach being sold by Marathon. If you are buying from Marathon, or a Liberty fron Liberty, or a Millennium from Millennium I would expect them to have fully inspected the coach and provide a warranty.

Prevost would be the best choice for a chassis and drive train inspections. Don't expect a Prevost facility to understand the converter systems.

Most conversion focused service centers can inspect the converter systems. There are also independents that can inspect the systems. There are even some that will provide codriver and training on your initial delivery. If the coach is in FL, I know a guy ;-)

Never have the seller do the inspection. Also, like a home inspection, don't expect an in depth inspection. It would take days to fully inspect a coach. Your goal should be to inspect the most likely trouble areas and the operational state of all systems.