I have one of those Garden trolleys and taken it to Glastonbury the last few years.
They are bloody excellent, you can even stack all your rucksacks on top of it and with some rope tie them down, trolley remains completely sturdy, last year we had 3 rucksacks, 3 tents, 24 creates of beer (and so on) – no problem at all.
Won’t consider doing a trip without one now, i used to try sack trucks the lot with little success, this trolley really is the dogs dangley’s, even in the dire mud of 2007 it cut through it with no problems whatsoever.
Considerations you will need to make:
I wouldn’t bother taking the sides off if you can help it – could end up being a real pain in the arse. They normally fit ok into a hatchback but you will need to take the pulling handle off to get it in the car.
Take a few spanners and things, although nothing has ever happened to mine, having a wheel come loose and run off in front of you would not be a joyful sight particularly when fully loaded.
Your main consideration will be where to camp, think about arriving and finding you camping spot in the middle of 200 other tents – how will you get the trolley from the path you are on into your camping spot without mowing down all the tents in your path.
You will need someone with you to look after your stuff or find a Sherpa to get your kit physically to your camping spot, and then carrying the trolley over tents avoiding guy ropes is not an easy task. My advice would be to get there early and find a spot on the edge of a camping field.
Storage of trolley, I usually take a tiny one man tent to act as a garage

, once your all sorted erect you garage and park your trolley – can then also be used for a handy beer tent as well. Alternatively take the trolley back to your car but for me when I am in I am not going out again until Monday.