A fleet has problems a single balloon does not. None of them are hard, but they are worth knowing before the boxes arrive.
Storage
Each balloon folds flat into its own carton, 60 by 26 by 3 inches for the common sizes. Store them dry and at room temperature, and do not fold or unfold one that is frozen.
Polyurethane tolerates the fold-and-store cycle indefinitely, which is exactly why a fleet works. PVC does not; it stiffens and cracks along the fold lines after a season or two.
Rotation
If some sites fly every weekend and others rarely, rotate the stock rather than letting two balloons do all the work.
Label the cartons and keep a simple note of which flew when. It sounds fussy and it is the difference between a fleet that lasts a decade and two worn balloons plus a cupboard of unused ones.
Helium across several sites
Talk to your gas supplier about the whole account rather than site by site. Larger cylinders and better rental terms are usually available once they understand the volume.
Use the fill column on the prices page to work out your monthly consumption. A fleet of 13-foot blimps flown at weekends uses far less than the numbers suggest, because loss is about one percent per day and they spend most of the week boxed.
Who holds the wind rule
This is the real fleet problem. One person can watch a forecast. Six site managers cannot be relied on to all make the same call on the same Saturday.
Decide up front who owns that decision and how it reaches each site. Weather loss is not covered by any warranty, and across a fleet it is the only failure mode that costs real money.
More at arizonaballoon.com.