Ask the facility if they have a cart you can borrow. The places I deal with are usually very generous in that regard.
I have a hand truck that I bought from U-Haul for $60, like these: http://www.handtrucksrus.com/ This card can be used like a regular dolly (like when moving a refrigerator) or the handle can be changed to turn it into a flatbed. I have a big sheet of thin plywood in my van that I lay on it as a base and I can get 3-4 tiers of cake on it for a one-trip delivery. Just make sure the board is the size that will fit thru the doorways!!
oh, yes, that. well, you have to bring someone along who owes you a favor. you make that person do all the carrying. especially the heavy stuff. i use my brother. he owes me big time from beating the crap outta me when we were kids.
sorry, i couldn't resist.
the dolly cart thing sounds like a great idea. 
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