Long days of direct sun can be tough on hoses and regulators, and white RV covers with better uv/dust/weather protection help cut down on that wear. Use them to keep gear covered in storage or at camp when you want added defense from grit and sun.
No, hard plastic or metal options for dual 40 lb tanks aren't available. White covers in this size are vinyl. The 40 lb tank size isn't very common on RVs, which makes hard covers difficult to find. If you want a rigid style for 40 lb, plan on alternatives since none are in production per our info.
Pick the size that matches your tank capacity. Some covers fit perfect, but others can be really tight or just barely close. Check clearance over the bracket and regulator since tight covers may not wrap around the mount. If the hook-and-loop is hard to align, it can slide up during a drive. Measure around the installed setup and expect a snug fit.
Yes, a white vinyl cover helps protect hoses, the regulator, and tanks from sun and weather. These are water resistant, not waterproof, and have an open base. The top takes constant UV and can dry out and crack over time. A vinyl protectant might help a little but would need regular reapplication. Check that the fit is snug so it doesn't flap in the wind.
It can, but secure it well and recheck on long drives. Some users had to keep adjusting the hook-and-loop after several hours, and one reported it sliding up on a 4 hour drive. Wind can tear the bottom if it's left loose. Cinch it snugly around the base, ensure the top panel is seated, and verify the closure before heading out.