the time has come guys!!

been wfp a year now but dont want to be lugging around the trolley all the time.it will be defo handy for some jobs but im going to try a full van mount!!
sticking with the kangoo for now so was thinking:
250L LAYFLAT TANK
GARDINERS 100M MICROBORE HOSE and LIGHTWEIGHT HOSEREEL.
i will be carrying say two 25L barrels as well giving me 300L a day.
so will it be ok to leave the trolley in the van and simply hook it up to the tank?i want the microbore on the hosereel to fit straight on the end of my trolley hose(rectus 21 connector).will i be able to do this as most fittings on hosereels are hoselock connections arent they?i dont want to change the connector as i will need the trolley for some jobs thus cant change it.this could be a problem.
also i need to make sure of the measurements first before buying a tank.another thing is i need to secure it in the van.
rachet straps?i really havent much of a clue.i was thinking of asking the local mechanic to bolt it in the back for me.
any advice would be welcome guys.and do any of you use your trolley hooked up to a tank and how do you go on hooking your 100m microbore to your trolley hose(as mines rectus 21).
many thanks in advance guys
best wishes to you all
dazmond