Aint read any responses but why are you getting leaks and from where? This might help in answering your questions.
Everyone saw my refitted van quite a while ago and if not, check it out on my you tube channel under NKservices. Many said my shelf which sits my reel would smell like a wet dog as I used carpet tiles on top and then sat my fixed electric diy reel. Underneath the shelf is my pump and batteries. Everything is bone dry! From the tank to the pump, I jubilee clip the hose straight on (via the elbow joint on the pump). From the pump to the reel, its the car radiator hose which again is connected straight to the swivel on the reel via a jubilee clip. Obviously really tight. Absolutely no leaks