What would you think is fair/acceptable?

At the very least until my husband can get rid of an old car of his to make more room on the side of our garage, I was thinking of asking my neighbor(s) on either side of us if we could park the boat/trailer in their yard during the summer/boating months. The one guy has a double- lot, and the area closest to our house has an extra garage and he usually always has SOMEthing parked over there - a boat that they then sold, old cars of his sons', a VW van the one son bought to work on (and hasn't touched yet), a pop-up camper. It's not like he's not used to something being there, it's just that usually it's his own stuff, not a neighbor's.

The other neighbor for the most part doesn't even live in his house anymore. He moved over a year ago about 60 miles away to live with his fiance (I think they're married now) for work. He does construction and apparently that's where better jobs were. Anyway, he/they only come up to this house once in a blue moon. He used to have a boat himself, several years ago, and he parked it alongside his driveway in mulch that's right on the other side of the split rail fence separating our front yards. So there is room, and the driveway would still be empty for when he does come up here occasionally.

I was going to ask one of them if we could park the boat/trailer in one of their yards during the summer, but I don't expect to do it for free. Would would you offer? The same $10/foot as we're going to pay for the winter storage? Or less because the winter storage offers protection from the elements, whereas the neighbor's yard it would be exposed (altho with a boat cover on it when not in use). With the boat and trailer, that'll probably come out to about 22' total (I'm assuming the barn guy bases it on the total length, not just the lenth of the boat itself), so it'll be around $220 for the winter storage.