I'll just add my thoughts about amp running boards, in case you guys interested are wondering about real-user experience: I love mine! They retract up high for excellent ground clearance when driving, and they lower so far down below where a regular set of step bars would be that it makes getting in and out no more difficult than a set of stairs. Of course, everything electronic and motor driven can incur it's own issues (like the time the wiring in one of mine corroded due to water intrusion, had to track it down and do a splice, no big deal, but during that time when I was climbing in/out the van without it, I really gained a new appreciation for how nice they are), but the electrical circuit of the motors are protected by a breaker that would trip in a deep water crossing. As for contributing to this thread... I don't know what a reasonable price would be.
2009 E-350 Lopes 55