To your question $600.00 sounds steep to me, unless they are applying a coating which is a whole world of difference than wax or sealant and certainly will have UV protection. On all three of the RV's I have owned, the manufacturer has stated to use a good quality marine or RV wax. In doing so they will have UV protection. Sealant is better than wax in that it will last longer than wax and a coating will typically last 2 plus years. I would find out specifically what kind of product the detailer uses. If it is a wax or sealant the price is too high for a new rig. We just purchased our new rig, although the manual stated a good quality marine or RV wax or sealant, I called the company to see what their tech people might recommend and the product recommended was Protect All.