Bob, we think the same! 4 & 5 could be good to keep for stepping on when taking on fuel (the boat will be on the trailer but sometimes one needs to take on fuel when in the water). On the other hand, I often drift in the middle of the fjord swimming from the boat - will they be uncomfortable when getting into the boat again?
How hard are the 1-3 to get off? Any tricks?
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EDIT: I See we use our boats the same way (except our dog does not fit in the SS)... She weighs in at about 120lbs.