The last few months I have be posting a few questions on semis that show just how little I know about them. Here is another.  On a previous posts of mine people have mentioned to buy the best hopper trailer I can afford and get a cheaper tractor - why?  That seems to be the opposite as I how I would look at it.  My logic is the tractor has alot more moving parts than the trailer and you would want that to be the better unit. I'm sure there are more of these dumb questions to come.  As long as it's not cracked up, bent or, rusted what can be that bad on a trailer compared to a tractor.