what about something like a boat gas tank, looks like you can get them in 18 and 24 gallon sizes. Should be easy enough to load in the truck, then fill them up. Then use a small battery powered pump to fill the sleds from them.
Something like this for the tank: Boat Tank
This pump looks nice:
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Something like this for the tank: Boat Tank
This pump looks nice:
Sent from my iPhone using Tapatalk