I wasn’t even going bother to reply, but anyway.......
There is no single answer to the OPs question, if for no other reason, that what is a “good wax” is totally subjective, and expectations vary widely on what is a “great finish” even among “car guys”.
I will assume the coach is full body paint, base coat / clear coat, and if it’s not, just ignore my input.
Here is a link to a current thread, with additional links provided within several posts. If you want to learn more about exterior detailing, what to do, what not to do, and what you can do given some serious time and effort, lots here to delve into, as well as plenty more opinions of “what’s best”.
http://www.irv2.com/forums/f278/wax-...ff-414725.html
It will probably make your head spin if washing and caring for the exterior of your RV or cars something you could care less about, and is a chore you dread doing and try to spend as little time and effort as possible.
And in that case of little to no effort, it really doesn’t make any difference on what you use, other than some sort of sealant (synthetic wax) which is simply easier to use and more appropriate for use on an RV than a carnuba wax. Even in that case, it’s more about the care and time you spend than the product you use.
High quality micro fiber cloths / towels are a must, and how you wash is probably the most important aspect of exterior care (plenty about that in the links provided).
Just a side note, I consider spray on / wipe off products an “enhancer” for use over a good, proper base wax / sealant that is used after washing, but not as a a standalone product. But, if that’s what you want to do...
YMMV