I am just about convinced that if you can get through the first 5-10k miles, the rest is easy.
Sorry to hear about your problems. I assume that the Chevy dealer you talked to has sufficient lift capacity to handle your unit. Otherwise, it shouldn't be much different than getting an Impala worked on. The transmission you have has been around for awhile, so you can either figure that the problem is minor, or it is good to get a defective transmission replaced early in the wear cycle. My unit had an engine light show up before I took delivery. The service department set up an appointment before I got the coach with the Chevy folks, and they replaced an Oxygen sensor, but found (after several hours of trouble shooting)that a screw had penetrated part of the vehicle wiring harness during the coach construction. In spite of the potential for mutual finger pointing, R vision authorized payment with no delay. Total time down was two days! I look at the first couple of months as more of a "shakedown cruise" than buying a new car and try to be patient about some system failures, resulting from one of many suppliers of equipment for the coach.