I like Winnebago/Itasca units, and the related Chalet series made as rentals. I think quality of materials and attention to detail are above average. The fiberglass roof is a huge advantage. I also value their online documentation and factory support of parts.
Speaking of documentation, it seems the rearview camera wiring is part of the main body harness. If you go to gowinnebago.com and select "owners" the "manuals and diagrams" there's one on "backup monitor installation" and Note 5 sounds like it's already there.
You're working with a dealer. Tell them you want it weighed, front and rear on a commercial truck scale. At 27-ft long with a 14' (168") wheelbase, there may be inadequate weight on the front axle. If you don't have at least 1/3 of total truck scale weight on the front, the coach may have a tendency to wander. Download Michelin's RV Tire Pressure Chart. Have them weigh the coach then adjust tire pressure according to the weights. This really should be done with the coach loaded as for a camping trip, but the empty state will give you an idea. Particularly if FRONT tire pressure is higher than the load requires, coach won't track steady. The brochure specifies axle max weights of 4600 Front and 9450 Rear. Be sure Front has enough weight and proper tire pressure. Be sure Rear isn't overloaded. Max "sidewall" pressure of 80PSI Rear may make the ride a little harsh but doesn't compromise tracking.
