What i did was build my own Trolley set up which has the pump and battery on,that also runs a tank in the van that i can connect when i need it and i carry a few 25 litre containers for the trolley,iv`e got 60m of microbore hose on a reel,i would`nt commit yourself to just a van system or just a trolley,it`s best to have both,so much more addaptable, every job is different and you need the choice,
i would reccomend gardiner pole systems for certain products,their tanks are unbeatable and also their poles,Gaz