How would you incorporate exercise equipment?

I personally have 2-5 lb weights and a portable stair stepper on trk along with elastic bands. My problem with all of these on the trk is the storage issues. The weights have hexagon sides so they don't roll around but they still get under things and I'm constantly searching for them. The elastic bands hang down from my hand rail from the top bunk and constantly swinging causing my students to want to throw them away. I do walk as much as I can but would like more stable equipment on the truck as my truck usually doesn't stop for long periods. Space is a large issue in our trks and storage is limited so anything that can be tucked away and utilized while vechile is in motion is appreciated.

I look forward to finding out what you accomplish. Hope this helps.