I installed the air bags myself. It only took about 2.5 hours. I was able to find a new set on ebay. They are Airlift brand model 59514/59534 and will fit both 4x4 and 4x2 ST's. I paid $140 shipped to my door. J C Whitney quoted me $185.00 plus freight. You can download the installation manuel from www.Airliftcompany.com. They are very detailed and easy to follow. They work very well, you can inflate them up to 100 psi, at 60 psi they more than leveled out my ST with the trailer loaded with gear, water and one horse. I think that for short hauls, even a sceond horse would be fine. The controller is also fairly easy to connect. The prodidy does not need to be level, so you can mount it almost anywhere, but being able to use the manual lever to apply the trailer brakes realy makes it nice. I used the stock 4 pin plug with a 6 pin adaptor. The two extra wires are red, goes to +, I T'ed into the power port at the rear of the bed. The blue wire, I ran forward into the center console where it connects to the controller pigtail. The other three wires to the controller are simple also, one goes to ground, one to + (I used the power port at the center console), and the other to the stop light (I used the power feed to the CHMSL). I carved a hole big enough for the cotroller plug to fit through in the bottom of the center console. When it is not being used, I just stuff the plug into the void under the console. I cover the hole with the stock rubber cover. I used the cover as a template and made a wooden blank to fill the floor of the center console, I added a short piece of 2x4 carved to match the contour of the controller. I painted the wood with a wrinkle finish paint so it looks like a oem part. I added a self taping screw at the lower plate to keep the unit secure. It makes a clean install, and yet can not be detected when I am not using it.
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