Pat,
I have been using HanDBase since Palm III days, more than 10 years. It now sits on my iPod Touch and holds a couple of dozen small databases, including
a couple that contain teardrop and camping information.
We have only been on ten TD trips since last April when we picked up #357 but keeping data is in my blood so those trips are well documented, both in HanDBase databases and in a handwritten log book.
You should have no trouble building (and modifying after using it) a database in HanDBase to keep track of whatever interests you. It does have a desktop version but I do all of my development and data entry right on my iPod Touch.
HanDBase has a small relational capability that sets it apart from other iPod/iPhone/iPad record-keeping apps, which you might find interesting if you have a background in db design.
Don