Ok, I have done this, but not with three teenagers! We bought a 33 foot 5th wheel with triple slides and took off for about a year with my husband's work. I put my fabric in sweater bags with zippers. While we were packing, my husband came in and told me I had fabric in every nook and cranny and I couldn't put any more in there, so then I put the rest in the trunk of my car. A few days later my son asked me why my car was leaning! LOL I had to redistribute my fabric.
I said all that to say...........You probably wouldn't be able to complete too many projects in the three month. Think about a few projects you might want to complete or start and get everything you need together for each one. You also might want to consider doing QAYG method to keep bulk down.
Hope this helps. Happy traveling.