We have a 2010 Tour 42AD and have had it weighed a couple times. I also read the FMCA coach review and subsequent
discussion between FMCA and Winnebago (click to review) and noted that there apparently some significant differences in the weights.
I have had these exact weighing discrepancies as well. When weighing at each corner on individual scales (at FMCA rally), my coach came out almost at the exact weights noted in the FMCA article. As it happened, I was at the Winnebago factory the next week after this weighing and reported these weights. Winnebago then checked it and found that their weights were notably different -- less weight on the front axle, more on the drives and less on the tag. In short, things were fine.
Then, two weeks later, I had it weighed again using independent scales (at the Escapees Rally) and noted the higher weights similar to the original numbers. My loading was virtually the same each time, so I could not figure out what could be going in.
Finally, I think we figured it out. The tag axle weights were about 10,800 -- well over the 10,000 gvw - but the drive axle was only about 11,000 -- well UNDER the 20,000 gvw for it. Then we figured out that the tag air bag was over inflated. I dumped the tag air a few times and then the weights for the tag/drive axles moved into a better relationship. Also, when the tag is over filled, it apparently moved weight forward to the front -- adjusting the tag helped that too.
Bottom line -- it appears that the tag axle air valve regulator is faulty and sometimes fills correctly (causing correct weights) or overfills -- causing incorrect loadings. We will get that checked now and I think this will take care of it.
Finally, the coach has been great on our 7,000 mile break in trip this summer and we really enjoy it.