I sort of follow your convenience/financial logic as to why your not taking RV. However for me I am always trying to take RV.
Alternatives to the RV are never/seldom on the table. In my overall cost analysis if I am not using the RV why have it? The only way for me to get value out of the RV is to use it.
I have already committed to future fuel and CG fees when I purchased RV. I do not analyze my fuel/CG cost for each trip.
I know the RV will always be more expensive than just taking the car, but I get the pleasure of enjoying the RV which is the whole point of having it. When doing financial comparison of RV VS. car/hotel. Restaurants and eating out with the entire family becomes the financial equalizer favoring the RV.
When I start concluding that it's not worth taking the RV is when I will consider selling the RV and getting out of the RV game.
For me letting the RV sit idle is more of a waste than using it!