I am going to disagree with Larry. I have adjusted the ride height on many coaches with my un-loader tool and we ALWAYS do it with the weight on the wheels. If you do it with the wheels hanging you have no input as to how much the coach has raised or lowered when you turn the adjustment tool screw. Doing it by dropping the wheels means you will have a very long procedure because you will have to drop the coach, drive it around, and then measure see what your adjustment results are over and over again for each correction. For each correction you will have to set it up again.

The 6 turn per inch is just a guideline. As you start to turn one side the weight transfers to that side and the first few turns usually just twist the bar without raising the coach. So if you turn the screw on the light side of the coach you will get more than 1" for 6 turns and simultaneously will get some lift on the opposite side. If you are turning on the heavy side you will initially get no lift followed by less than 1" on the heavy side.

So my recommendation is to LUBRICATE the screw on the adjustment tool liberally. I use anti-seize but oil will do. Then adjust the bars on both sides with the weight on the wheels. After adjusting the second side, recheck the first side, and change it as necessary. Go back and forth between the two sides until no change is required on either side. Then drive the coach for a few miles and recheck your measurements / adjustments.

It is imperative that the REAR END be blocked in place at EXACTLY EQUAL height during the front height adjustment. We have found that a 1/4" difference in side to side height in the rear will transfer 125 pounds from side to side in the front (with a corresponding change in front ride height).

One other comment on your procedure. You can also cut some blocks for the front height measurement to the bottom of the frame rather than tape measure to the top of the holes. I do not remember the dimension of the blocks at the moment and my measurement stuff is not at home for me to look at right now.

I cut up a bunch of scrap lumber and handed out the pre-cut blocks at several of the GMCMI rallies. The blocks make adjustment much easier. I use 1x2's for the front blocks and 2x4's for the rear blocks so we do not get them confused while using them. Front and rear are different lengths.

Good, I'm glad it works for some. It certainly Would save a lot of time and effort. But, I personally have stripped the screw on the tool. It was on a tool that I made up as a dual purpose tool from a Warner wheel bearing tool that I had. You can see it here. It served me well until the bolt and nut stripped. So I've erred on the safe side ever since. I'd say...you can try it...with the couch down. If it doesn't feel right...Stop. JWID
http://www.gmcmhphotos.com/photos/front-suspension-adjusting-tool/p9162.html

Thanks for the opposing view Ken...always good to hear polite descent.

*********UPDATE***********

First of all, mine was a real pain in the rear.........
The PO used a real good thread locker on the pork chop set bolt. It took what seemed like all day to get them out. And that was with a 1/2" drive breaker bar.......It actually required twice as much force to remove the set bolts than it did to compress the pork chop with the unloader tool...
After taking the bolts to the wire wheel for cleaning, I coated them with anti seize. They went back in with no problem.

Since this was my first time to set the ride height, I erred on the cautious side and lifted the front end till the wheels were off the ground before I compresses the pork chop with the unloader tool. All went according to plan with no hiccups. I ran out of time, so no test drive to allow the front end to set in. Hopefully that will be in the next few days.

I have a friend who has extreme duty Kent Moore torsion bar unloader tool. When I get a chance to fine tune the front end height, I am going to use that unloader tool and attempt to set the height WITHOUT raising the front wheels off the ground. I just don't know how I'm going to fit under the coach without the front end jacked up.......I will post results when finished....Scott out..