It was great to have weight, and ride height checked. My LF was 2100 lb. RF 2250 lb. LRF 2100 lb. RRF 2100 lb. LRR 2000 lb. RRR 2000 lb For a total of 12,550 lb. It's a 78 Royale. The front height was right on spec. The rear was + 3 inches. I lowered it some for the weigh in. I generally run it in the + 5, to 6 inches plus range. Due to the door ramp that hangs below the frame rails. Yes, their hot dogged. But that's the way I can save the $600 ramp hanging below in the ramp rack.Bob Dunahugh GMCMI Member
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I looked at the spread sheet and your weight on the rear sure looks messed up. I'll bet we mis-read the scale or recorded the number in error.

It is impossible to get good help for free these days. The scribe kept writing the numbers upside down thinking he was in Australia. The 1's, 3's, and 8's were OK. but the rest of the numbers especially 6's and 9's were a real pain. He actually took a picture of the sheet before he left and said "call me if you can not read my writing".

All joking aside it looks like we screwed up on the number for your right rear.

I reworked the spread sheet and added some columns for differences and averages. It is quite a busy sheet but you ought to be able to see where you are, and also where the others came in on their measurements. There were only two others that came in nearly as bad as yours. One had a 4 bag system with individual shut off valves. The other had a wireless system that does not adjust to height. We also had one come in jacked up as high as it could go with shut off valves installed. He was at +3 inches or more so we recorded him as N/A .

Look at the last one on the list he was perfect.

http://www.gmcmhphotos.com/photos/data/6687/GMCMI_Weigh-in.pdf

Keith has a 500 pound difference between the right middle and right rear. Something is strange there unless he has a 4 bag system. ...

That is exactly what we have observed over several weigh-ins in the past years. On the 4 bag system, people have valves to play with and get the two bags isolated from each other. We had another one this time that had shut off valves and was 3" high with them.

The whole idea of these weigh-ins at rallies is to give people an initial idea where their coach is and let them decide where to start correcting things. It also give then the total weight of the coach no matter where other adjustments are set.

Obviously rear ride height has to be the first thing to fix. We have found 1/4" difference in rear ride height translates to a 125 pound left - right weight swap on the front wheels.

This time we had them drive up on a pair of 2x6s when approaching the scale. That left about another inch to go up when they were actually on middle of the scale. So rear wheels were close to level when the middle wheel was weighed, but 3" difference when the rear wheel was weighed. I guess I'll have to bring four scrap 2"x6"s about 4 feet long to the next weigh-in and see if that makes any difference on the middle to rear readings.

Ken Burton wrote on Sat, 04 October 2014 22:40

That is exactly what we have observed over several weigh-ins in the past years. On the 4 bag system, people have valves to play with and get the two bags isolated from each other. We had another one this time that had shut off valves and was 3" high with them.

The whole idea of these weigh-ins at rallies is to give people an initial idea where their coach is and let them decide where to start correcting things. It also give then the total weight of the coach no matter where other adjustments are set.

Obviously rear ride height has to be the first thing to fix. We have found 1/4" difference in rear ride height translates to a 125 pound left - right weight swap on the front wheels.

This time we had them drive up on a pair of 2x6s when approaching the scale. That left about another inch to go up when they were actually on middle of the scale. So rear wheels were close to level when the middle wheel was weighed, but 3" difference when the rear wheel was weighed. I guess I'll have to bring four scrap 2"x6"s about 4 feet long to the next weigh-in and see if that makes any difference on the middle to rear readings.

I'd also make sure the driver puts the coach in neutral and foot off the brake otherwise you would see some brake related jacking I think. unless the coach has reaction arms....

Ii think I'll look at the data and see if reaction arm coaches are more even mid to rear axle

The thanks needs to go to Bill Micheal, Wally Anderson, and our favorite Aussie that did not take kindly of my teasing him, Rob Mueller.

They did all of the work. All I did was to supply the scales and fill-in a spread sheet after the work was done.

Rob had some good suggestions for next time that we will implement. Probably the best one is do not criticize the scribe. Rob worked until the last minute to get all of the coaches weighed and then hopped in his car to make an airplane flight.

Thanks for the help guys.