I want to get a cheap/older dump truck for doing jobs around the acreage, hauling gravel, garbage runs, moving things, etc. I see lots of older grain trucks in pretty nice shape going for fairly cheap. I know I want a steel box but not sure what the difference is between a grain truck and a dump truck. I'm looking mostly at 70s era 1 tons. Are the boxes built weaker an grain trucks? One I saw pics of looked like the back didn't open wide, is that normal? I realize gravel is way heavier than grain and have no expectations of hauling more than about 2-3 yards at a time. Anything else I should know about using an old grain truck as a dump truck? Do they lift as high?