Hobbies on the road?

We are woodcarvers/woodburners and I also enjoy a pen and ink/rouging type painting. We have our woodcarving and wood burning supplies in large toolboxes that fit nicely in an outside compartment. My painting supplies are stored in a small toolbox and can fit anywhere. We aren't into power carving so we don't have any heavy duty carving tools.
We enjoy reading and visit every thrift stores/junk stores for our books. When we finish we swap them in at the campgrounds' book collection.
Could someone store your expensive books until you decide to come off the road or you decide you don't really need them?