When I installed mine, without removing tires, you just had to tie up some wiring for drilling thru side rail. In order to drill from inside out made a pattern of holes existing and where two new ones will be added so could mark with punch on inside frame rail. I jacked up coach and added stationary jacks under frame to gain room under coach when drilling than dropped frame down after installing brakets to place in air-bags.
I installed bags all around and added air compressor in one of the rear compartments with controls valves tubing and control gages.
If your just putting in bags tubing can go to fender wall or out back near number plate.
Like I said before the angle iron in wheel well had to be removed and cut to remount after braket was installed. You may not have this problem. Could not mount braket with angle iron in place because braket would not set horizontal for bag support.