I would look at costs. How many nights will you realistically spend at the seasonal spot? How much more will the seasonal spot cost over the storage facility. Divide the latter by the number of nights. If it's less than $X per night for the seasonal, go for it. If it's over $X per night, don't. You have to agree before calculating what your $X is going to be.
For me, my RV is stored at home so that was not an issue. However, my first year, I picked a different location for each trip. The next year, I went back to my favorites for a long weekend and then tried new locations for the other weekends.
Several years later, I am still doing that. I go to a few repeats and try out some new sites each year. It works well.
