I dont want to use a trailer system day in day out but build one as a spare for my van system just incase anything bad happened. I was thinking a 500ltr tank on a trailer chassis with metal bands, and a pump and battery and use the hosereels from my vanmount. Recently we had to get some work done to the brakes on the van and we missed two days work so having a trailer for those types of days would be great, it doesnt cost alot to build but saves alot of hastle! Luke