U-Haul/moving trucks and "damage insurance"?

I have to rent a moving truck this weekend just for 1 trip (to basically move stuff from one storage unit (spare garage) to another (mom’s house). I reserved one online and got to the part about paying $15 for damage insurance and it’s freaking me out. I generally never purchase these things but when it popped up it made me stress, because I’ve never rented a moving truck before.

Any help/suggestions would be appreciated!