When searching for an extended service plan for your RV, do not consider Cornerstone RV. When we bought our coach at LazyDays in Tucson, they pitched Cornerstone and we paid $6,178.00 for a four year contract with a $500.00 deductible. I currently have the coach in for service at a Caterpillar dealer. The Cat techs diagnosed the problem as a faulty fuel pump on Monday. Cornerstone has stonewalled the repair until Friday morning, if I am lucky enough to have them finally make a call to authorize the repair tomorrow morning. I have just wasted several hours on the phone hearing the normal "we have policies and procedures we must follow". When I mentioned I would like to have my coach back, the response was "it has only been two days since we started our review". They actually required a third party go to the Cat dealer to review the diagnostics. Really. This isn't a shady back alley mechanic. This is a certified Caterpillar dealer with certified technicians working in a new facility with state of the art equipment. How insulting to this dealer. I expect extended service plans to be annoying at best, but have found this lack of service plan to be absolutely unacceptable.