We found that if we simply reverse the hangers it greatly reduces the
times they jump off the rod. Try facing the hook side towards you rather
than away from you.
Also you can get a foam "noodle" pool toy.
Slit it longways.
Hang your clothes as usual.
Place the slit noodle over the rod, hangers and all.
When you arrive you can remove the noodle for normal use of the closet.