I used to have a pickup truck that everybody wanted to borrow. After getting burned, My official policy became:

Take my truck but leave your car behind

Whatever happens to my truck will happen to your car.

Whatever crap is left in my truck gets dumped into your car's front seat

I'll siphon all the gas out of your car if the tank isn't returned full

You can always rent a truck from U haul if you don't like the conditions. They are nicer & more understanding than I am

Never had anyone borrow my truck after that. I'll never lend a bike. Stopped lending tools after losing a couple.