I know that at least once a year the good sam magazine has an article regarding this. Their lobbists work hard at the state and federal level to keep the additional liscense from becoming a reality.
They also help with conenant fighst, and excessive tag/taxes on RV's as well as making sure that the stae and federal gov. does not become to limiting toward where we can drive our RV's
Fred, I agree with you regarding the issue of size vs. experience. Some of the RV sales people I have talked to say they try to steer the prospective buyer into soming smaller due to size of some of the coaches they are looking at, but when the 70+ year old guy says he wants a 40 foot $500,000.00 motorhome the customer wins.
The only thing I can see that could resolve the issue is mandated testing and limits like are placed on Motorcycle addendums. You are rated to drive up to a certain wieght limit, and if you upgrade coaches you have to re-certify.
This would require a whole additional level of employees at the DMV
Or schools that offer driver training. I know that some dealers require that the new owner take a driving course with their new motorhome and an instructor as part of the delivery.