I'm looking into getting a compressor to air down on dirt roads for better ride quality. I don't want to buy a cheap one that's unrealiable,but also can afford an expensive one. I'm looking to spend $150 or less. Can you guys give me your experience with compressors in this price range? I have a Tacoma with a plug in the bed. Do they make any that Plug-In or do they all pretty much clamp onto the battery? How much pressure do you generally run on dirt roads?