Well, before spending money on a vehicle get your degree in expediting just like you would in refrigeration or paralegal or mechanics or any other career. The fortunate thing is you can get your degree at no cost, other than time. Read back at least 5 years in the General, Newbies and Recruiter forums here. Not every word, but read every single thread title. When one sounds at all interesting or educational for you then read every word of those threads. Yes, it will take you several weeks but how long does it take to get a paralegal certificate or master plumber certificate?
Once you've read back at least 5 years you won't be ready but you will be well enough educated to know what you don't know and be able to ask questions to really get there.
Vehicles. The more you can safely and legally haul the more potential jobs you'll get. While driving a 40' straight truck my smallest load was basically a shoe box weighing about 4-5 pounds containing some super heavy duty circuit breaker to get a Tyson chicken processing plant going again so 200 employees weren't standing around. I also had a similar sized box, about 12-14 pounds, with some sort of fastener for the line at Caterpillar that should have been making road graders and similar oversize equipment. That one cost about $10k per minute of down time.
Yeah, a van could have taken either one but there wasn't a van available so I got them. The van sat and waited when I got the 4 skids with 9k pounds of Duracells and who knows what all other loads. My smallest load ever, after I switched to a van, was a legal envelope with a roughly 150 page contract, no more than a pound or so. So you never know what you may get but the more you can carry the more chances of getting something.
I switched from the 40' truck to a Chevrolet 1 ton van the last 3 years on the road for the convenience. I could go eat anywhere I wanted and find a place to park. I could park in my driveway when I came home. If I were going out again it would be in a van with a higher roof, probably a Ford and either the mid-roof or the high-roof. If I were 20 years younger I'd probably go with the 40' truck.
Bottom line, you can't do too much research and studying before starting.