wanting trolley also now but yesterday i had a chat witha forum membe ron here who gave me some top notch advice on what to do if my set up is DI. I hadn't heard of it before and it will make the van tidier and less stuff to got tits up also.
been told fill from tap then through my DI and then into van so that i have DI water inm tank and wont have hassle of vessell's in van, more leaks air locks in them etc. But also carry my spare DI with resin in cas ei want to fill up whils tout n about.