Congrats on the deal and now owning a Jayco!!
As for waxing, I have only used Meguiar's products on my trucks, cars and now my Trailer.
You will get many different answers for wax, but I would simply recommend anything you are comfortable using and any brand that uses "Carnuba" wax.
There is a post on here somewhere regarding the grill. If I remember correctly, about 1/4 of the people prefered or used that grill.
Others use their own gas or charcoal grill. I prefer charcoal and really do not want to take the chance of having grease splash on the side of my TT. It is also located under the awning on my TT.