Danss,
Not much more to add, Jeff and Jon covered it well. I just bought my Marathon in February and wen't through the same process. I bought through a broker, but was able to talk to the previous owners and had a pretty good understanding of the previous maintenance as well as any pending issues. I had a PDI done in Dallas at Prevost and they had 3 different levels of PDI, depending on how much money you want to spend. I chose the 2nd level for about 350.00 and that included all the main items such as chassis, brakes, tires, batteries, all systems and a plug in to the computer for any codes and to verify mileage. The rest I did myself and the few items needed were taken care of prior to the sale. Do your homework on the previous maitenance and talk to the owner if it's through a dealer or broker. Any previous owner should be more than willing to share information with you unless something is wrong. Marathon is in San Antonio, FL as well as Prevost in Jacksonville.

Good luck, you came to the right place to find info... POG