we have had these topics before. saw some photos about yoga mats with little bean bags on them. = closed cell foam so no water gets trapped or anything breaks.
put them on flat surfaces, and maybe a typical car cover closed/down on the car. so that the mattresses do not move away.
it seems to have been a difficult thing to get everything right all the time. or someone in Texas or Colorado where they’ve been taking base balls and golf balls in bulk for a while will detail things you can keep in your trunk/luggage and always have ready in a minute. (before your head breaks too).
Maybe subaru should make cars that don’t get scratched or scratched by hail…
.and I’ve seen hailstone scratches on 1964 commercial trucks that would take 2 people to hold the hood up. (even solid old steel isn’t perfect).
but i sure like the Gen2 subaru underbody and the antique saturn doors you can touch with a rubber mallet.