I'm very careful about borrowing people's trucks. About 10 years ago, my vehicle was a truck and I seemed to be the go-to guy among my friends when they needed to move, or haul brush, or .... It wasn't the same friend every time but it got annoying to be loaning out the truck so much. When it was time to get a newer vehicle, I opted for improved gas mileage because I was using the hauling capability of the truck less than my friends were. So, I rent a truck from Home Depot when I do need lumber or building supplies that won't fit in my car. The rental is more than covered by the gas/insurance savings for the 3-4 times a year I need to get large things from the home improvement store.
I try not to be that friend that puts someone over the tipping point such that they too decide to get rid of the truck. I have borrowed trucks from my friends but try to minimize it for the reasons stated. It's got to be something pretty important to me before I ask. I'm fairly handy so I don't see this wire swapping to be 'worthy' of borrowing the truck. Now, if I really screw it up, I'll borrow the truck and take it to the dealer...