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Teach,There's something I don't get. If the spa is 80" and the amount of room you have is 84" is there more head room after you get into the area to swing the spa into position?A spa that's 36" tall and 80" square may have a problem rolling over into position IF you only have 4" left. You certainly can use 2" PVC pipe to roll the tub under the deck but if 84" is the max you have ... I think you need to rethink this.If it is only 84" head room to show my point ... get a square cardboard box and measure the the dimensions - length, height and depth; now put the box on it's side on a table and tip the box When the box is on it's edge - measure it. If you have pleanty of head room than no problem. The other way, can you roll the tub into position being flat vs on it's side. the pvc pipes should work this way also.
. I suspect some type of "usual" delivery is priced into the spas, and anything beyond that is subject to extra charges. I know cranes aren't included for most deliveries if they are needed.