My 2008 Discovery was my first full body paint RV. I purchased it new in 2008, and did very little to maintain the exterior. I routinely used the blue beacon truck wash, including the "acid", and never washed the front end after a days drive.
After about 3 years of ownership, I noticed it was looking a bit rough, and spent the big bucks to have a professional come out and wash it. He was the one that told me about the 3m bra, and the bugs. It was too late. I had him wax the paint, and stopped using the acid. The acid had destroyed the wheels, which are the same Alcoa wheels we have on our newmars.
I sold it in 2012, and the front end looked terrible. The dealer that I sold it to deducted $1500 from the purchase price after seeing it. I still sold it for $12k more than I had purchased it originally, so I felt good.
My 2013 was going to be treated different. I started the wash everytime we drove, and had a wax job done twice a year like clock work. Each wax job cost $750, and each time they did the wax, the swirl marks appeared to get worse. They would buff them out, but what happened is the clear coat eventually started to give out.
When I sold my 2013 DSDP in 2018, the paint still looked great. The 3m bra looked new, and the new owner didn't even notice the swirl marks until I showed him. Once you see it, you never "unsee" the swirl marks.
I had spent over $7000 having the coach waxed each time, and still had damaged clear coat, even though I was the only one that could see it until I showed it to someone.
On my 2019 I decided to spend the money up front. My coach was delivered with factory swirl marks, like 100% of all coaches and cars are. The paint correction was an 8 day ordeal, but in the end I spent a little under $7k, and have a 7 year finish.
Washing the coach is super easy, takes 1 hour from start to finish. No drying, and I can wash it in direct sunlight due to my DI water system. I keep 303 on the bra, and wash it daily when driving, and at the end of a trip. Sometimes I wash it mid day if I need to stretch my legs and do something besides drive.
So my advice is to pick one-- wax twice a year, or ceramic coat once.