>what size,type and other important aspects of buying a
>expediting truck for the most diversty in this industry
Ooooh boy! Opinions are legion on the question you raise and as suggested by another poster, an archive search will yield a bunch of information. The trouble is, it is conflicting information. Some believe in lift gates, some don't. Some believe in reefers. Some don't. Some like vans, some like straight trucks, and some like tractor/trailers. Welcome to the soup!
To help find your way through the bewildering array of valid options, you might want to ask not just about trucks, but also about the life you expect and are willing to lead on the road.
Are you running solo or team? If team, will you sleep with your co-driver? How much room will the two of you need in a sleeper? If the answer is "a lot," a C unit with a big sleeper may be the way to go.
Do you want the smoothest possible ride over the road, or are you willing to put up with bumps and jolts? (the bump an jolt truck will likely cost less).
Is off duty mobility important to you? If it is, the smaller the unit the better. Or are you a big-rig driver to the core and would not be happy in anything but a "real" truck?
Are you willing to handle freight or are you more of a no-touch driver? If no-touch is your preference, a lift gate is not something you want, since having one will bring you up close and personal with some loads.
Are you a buy-new kind of person? Or do you find joy in frugality? One way will lead you toward a new truck, The other brings used trucks into the picture. If you are open to used, you'll want to give bonus points to carriers that permit older trucks in their fleets when making your carrier selection. But also note that if you go that route, you are limiting yourself to the kind of freight those carriers haul and the economic risks such freight entails.
It does not matter what choices you make. Tradeoffs come with every one of them. Choosing a truck is at least as much deciding what you are willing to do without as it is saying what you want.
Do you want a lift gate? That means doing without shippers that prohibit lift gate trucks at their docks. Do you want a reefer? That means doing without the significant amount of money it takes to buy one. It also means doing without the carriers that have no reefer freight. Do you want a straight truck or E unit? That means doing without the easy U-turns B-units can make. Etc.
Expedieters succeed (and fail) in all types of units (B, C, D, E), configured in a variety of ways. Success in any of them is simply a matter of figuring out what the successful drivers do and then doing the same things yourself.
Happiness on the road is another matter. The more you can match your truck and the kind of freight you'll haul to the life and work you want to lead on the road, the more likely it is that you'll be happy in the work.
In that regard, expediting is like any other job. If you are able to align your work with your self image and personal interests, you'll be happier in the job than if you are not able to align your work with yourself.