Have you had any problems with the engine losing power? I have a Thor 22E 2014 with a Chevy Express 2013 truck. It is just out of warranty but the Chevy is covered to 100,000 miles. I lost engine power on a recent trip; I could not go any faster than 25 mph and it was shuddering and making noise. Chevy is giving me a hard time about their warranty....they say it is Thor's problem.