How likely am I to need 30amp and/or water extensions?

I just picked up a 25' extension. Have not used it (came within inches of needing it before I purchased), but after going to a park when 2 campsites share a common pedestal (lucky I had a different site), I picked one up so I didn't have to pay a premium from the camp store. I also carry 75' of drinking hose. My space in my hybrid is limited, so I am good for now.