Actually at one time Kyocera was one of the few companies that offered a warranty on their 135 watt panels if mounted on something mobile. Looks like nobody (at least I couldn't find one) will warranty them now if installed on a vehicle or boat. Of course you don't have to tell them where they're mounted
One thing about glass panels is they have been time tested but they can break. I shattered one of mine
but hopefully that won't happen again.
I wish they would sell semi flexible panels at a reasonable cost. Unfortunately my flat walkable Solars did not last very long and was a huge mistake money wise on my part. Everything semi flexible I've seen on the market has a beaucoup price.
If your goal is to just keep your batteries up and charged for maintenance, a small 80 watt panel with a good mppt controller will do fine but having the ability to supply a positive charge to your house battery system depends on your daytime load usage and how large and how deep you've taken down the battery system. Seems that a 130w panel is a reasonable size for a SMB when comparing a cost to preformance value. YMMV I have twin 135's on my van.