I don't think I would go either of those routes. There has to be maintenance done on the storm drains, even if it's only to clear a clog. One guy sees your stuff and it's gone.

As to the concrete curb section - In my driveway maybe, in a relative's driveway, maybe. Anyplace else, nope. It's going to be inherently weak, as it's hollow.

As you are in AK, burying is not an option (snow, frozen ground) so it has to be someplace above ground. Is a storage rental unit viable?

My question is why do you want to split the stuff up here and there? Store it in one safe spot, either at home or on your property.