Frame is a very different concept between a pickup truck and a Benz. Nearly all pickups are built as body-on-frame, where there's a separate chassis that mounts

Frame is a very different concept between a pickup truck and a Benz. Nearly all pickups are built as body-on-frame, where there's a separate chassis that mounts all the mechanical bits, and then the body goes on that. Nearly all sedans, wagons, and things that most people would consider "not trucks" are unibody. The body and frame are one and the same. The Benz in question likely had a detachable subframe at the front or rear where the mechanical bits are attached. It's pretty common to have bolt-on frame members (cross members especially), a fully detachable subframe forward of the firewall is less commmon. All that to say, they can sometimes straighten a body on frame vehicle. Whether this is a good idea or not obviously depends on the severity of the damage. If a frame rail is bent into a banana shape, probably not. If there's been some light shearing or twisting movement of one rail to the other, they can probably do it safely within limits. Remaining imperfections get taken up in the suspension (it's adjustable). If you wonder how they put race cars back on the track so fast, it's because they'll tolerate a lot of frame geometry out of spec if they can make it up in the suspension without otherwise compromising safety and handling. All that said, all of your points about the reduced value of the truck are certainly true.