Why HiLo's leak.
The reason any camping trailer leaks is because after a few years the windows
need to be taken out and resealed. Every year you have to check the roof and entire body of the trailer for any areas that need to be recaulked. Pay close attention to your roof. Put a protective coating on the roof. Such as Kool seal or the appropriate one for the type of roof you have. Use the buyers check list for any HiLo you are going to buy used.