Was at a campground out west, a number of campers had their hood's open on their trucks. When I asked why they said because pack rats get up into the engines and eat the hoses. Even at night the light
is just enough to deter the critters. Upon further research on the internet, turns out many people have problems with such things, even when at home and in the garage with the door shut. I live in TN and have not had a problem with hoses being chewed, but have seen animal nests in the engine compartment.
I have a Honda 3000 generator
mounted on the front of my Casita
on the Overtank platform. It had a drip hose hanging about 3" or so outside the unit. It was chewed off when we got home (from out west).