I always say an idiot can break anything. But a commercial mechanics service body must be the most durable component in the mix given the abuse they see in the field as a commercial vehicle.
A definite concern. Have to gauge your trail risk prior to commitment.
When I was searching for the right service body, the one I found had piano type hinges. It was an older style. Like I said in another thread, the newer ones that just has a little hinge on the top and bottom, if you rip that top or bottom hinge off, the door will fall off. With the piano hinge you could bang into it and I don't think the door would flat fall off. I've had that happen to me when my daily driver utility bed truck got sideswiped on the street.
On the commercial end I've seen mechanics need a skidder to drag their service truck & tools to a broken down piece of equipment. Or drive in, have it rain and need a skidder to drag them back to the road. The only reason you get damage on a tight trail is by not having the judgement to keep it centered on the trail. I see more regular bed pickups with that damage than service trucks.