It's an expensive option but flo fast hand crank and containers are really nice. I have 5 x10.5 gal jugs and a flat folding dolly cart from Costco. Fits three jugs at a time. Push the cart up to my boat, fill, and repeat.

Northern tool with $20 off coupons is the cheapest place to get them. Occasionally will see them used on FB marketplace.

Typically fill at Costco on my way out of town and figure I pay for about a jug per weekend on the $savings vs filing at station near the lake.