Well, for starters, I get down into my car, and up into my truck, but their roofs were designed by, you know, an engineer. There is a reason vehicles are narrower at the top then at the bottom. If you notice, most vehicles the edge of the seat and top of the door opening are fairly close in line. This is not true at all with a center drive tractor with a canopy or a cab.
On my tractor, not only do I have to get up onto it, I have to also go over the transmission hump, whereas in a vehicle you sit beside it. If you remember parking with your high school girlfriend, you remember traversing the transmission hump and... I’ll just say, none of us are as flexible as we were then and leave it at that lol.
So, to sum it up, your reply appears to be complete trollery.