Yeah I've looked in to them but heard quite a few people moaning about them that they not that good or well made an will go wrong fairly quick and it's a pain having to fill up all the time . I'm one hundred percent commited to this new buisnes and do hope to get a strong round going asap with money going to wards lefflets an fb so not so much thinking about wot if it don't work out but just want to take it one step at a time so basicly not rush in to buying a massive systeam when I've not got a clue wot in doing at first . If that all makes sense
When i first transitioned from working traditionally to wfp, i was going down a similar line of thought as you. I was going to invest in a pure freedom trolley set up and then if I liked it I could simply convert that into a van mount later. Im glad i didnt for a number of reasons, plus the cost of what looks a basic setup and many of the reviews is how heavy the thing is as well!!
So it may be a good thought at the moment, but many on here have tried these same approaches as your mentioning. Many may feel as I did, that now looking back at what I now know about it, I would have done it a whole lot different and perhaps save a couple of hundred (or more!) In the process.
Using a heavy trolley whilst you try and break into this line of work might kill the enthusiasm as well?! (trying not to make this negative) whereas a gardiner back pack, 20 - 30m of pole hose and perhaps a clx pole (if funds allow go for a SLX) would work out cheaper whilst you learn the ropes. So if things progress the way you want to, you've saved money to invest in a van mount and you keep a trolley system which is small and light enough to fit in the van as well