Mat I have 30 meters of microbore on it, and I use it constantly, as you say I don't take the trolley round the back, it's like having a truly portable van mount. You can get through a lot of work with 50 ltrs.
10 containers would last me all through a busy day on compact work, and most of my work is very compact, I couldn't be doing with moving the van after every couple of houses, and that's why I have never gone down the van mount route.
I can take the hose reel off by undoing 2 wing nuts. There is no welding done on that truck, and the only holes drilled were through the foot plate, everything is held on with bolted clamps.