I'm getting ready to purchase a set of the Loadlifter 5000 bags for my 2011 F250 (kit # 88396). This kit has the internal jounce bumper built into the air bag. I'm going to install them with a "T" fitting and only bring one line back to the rear of the truck so that they are both filled or deflated at the same time/rate. As I am reading the info about them, the ones with the internal jounce bumper built in, you can totally deflate them and you still have the jounce bumper to keep from bottoming out, whereas the older model without the internal jounce, you need to keep a bit of air pressure in them......someone correct me if I'm wrong. I don't go anywhere with the Toy Hauler off road (street and paved track type bikes), so the need for an onboard compressor is lessened. I also have a large compressor at home and an onboard Dewalt compressor in the T.H., along with an onboard Onan generator, so having access to air anytime I'm hauling the T.H. is not a problem. If at some point in time, I decide to add an onboard compressor to the truck for more convenience, it will most likely be a Viair brand as I have read very good reviews about them. The air bag install doesn't look terribly hard to do, but mostly time consuming....and will require a floor jack and some jack stands to be able to do the job. I was quoted $255 to install them by a local truck custom shop, and that seems kind of high, although after I'm done doing it myself, hindsight my prove otherwise. We'll see!