There are endless choices for cleaners and "waxes". The systems can be complicated and are often designed for a limited set of conditions. I chose Poliglow for my fiber glass exterior.
https://www.poliglowproducts.com/#/
Poliglow is a whole system including cleaner, wax, and wax remover. The cleaner is vital. It removes a lot of hard to see stuff that will become easy to see once wax is applied. It is good for 12 months in northern low altitude climates like Wisconsin.
I did one or two sides each year. The first side is now 2 years old and needs stripping and re-coating. Splattered bugs are starting to stick to the front again.
I have not yet removed the old wax. Some reviews claim it is hard to remove, but it is hard to tell from the reviews whether they used the remover designed to remove the Poliglow. Time will tell.
It is not a good idea to use automotive wax systems on fiberglass. Automotive systems are frequently designed for paint of different types. Many fiberglass boat systems work well. Painted aluminum is also has different requirements than steel painted with automotive systems.
Get recommendations from your TT manufacturer if you can.
I wish you good luck and happy trails ahead!