Hi, I will be a first time Sprinter buyer. What should I look out for when I test drive? I will probably be buying an older 3500 158"WB for $15 to $20K in the 60-90k mile range. Would I be better spending the extra 10 to 15 thousand for the 07 or newer with lower mileage. I am quite capable of doing the maintenace myself but would prefer not to have to do major overhauls. I will be using the truck as a mobile workshop/service van for a marine service business. I like the idea of the space but will the long wheelbase be really hard to park? Thanks for any help!