They don't fit everywhere, but I've always went with pickups. The gear and other odds and ends, eat up space quickly.
My favorite was straight six Ford with a granny low first gear, it could go very slowly. It was difficult to stall, but if it did, I could leave it in gear and just bump the ignition and it would just start moving again, really handy if pushing in the clutch would make it shift on a grade.
For now, I have to stick with the drive train of a three quarter ton. Everything is a bit sturdier, not for bashing around, but for a little cushion against odds and ends that turn up. Last year, I broke a front axle going through a tough muddy stretch. I saw the tire stop throwing mud, but it held together. I made a good hour drive back to familiar grounds, and got it to a shop later. Priceless.
Got to carry tools, straps, stuff, just in case.
