I know the context of the question is freight, but I'll answer in regard to advantages of the different type of trailers that you asked towards the end of your post.
I love pulling doubles. I've pulled all the sizes of vans, but haven't pulled a flatbed or tank. When comparing doubles to vans, you can actually make tighter turns and squeeze into tighter places, simply because of how the rig bends in the middle between the two trailers. But ... you have to pull through at most truck stops, usually on the edge so you don't get parked in. This is because you can't back up doubles. Well, technically you can, but it's quite a process.
I probably love pulling doubles because it's what I do 99.9% of the time, i.e. I'm just more comfortable with them. I enjoy the routine and process of hooking them up and breaking them down. Plus, they look cool. Maybe someday I'll get the chance to pull triples.
It'd be great if we had a resident tanker driver here on the forum ...
Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. However there are some states that allow doubles that are each 48 feet in length.
I am currently leaning towards pulling flatbeds with TMC. I like the idea of some physical work in my day. All of my jobs up to this point have required physical effort. Anyone on here ever work with TMC? Dry van would be my second choice. Mainly because I have heard it's a good way for a newbie to start. If I decide to do dry van I am hoping to be hired by roehl or Schneider. Any feedback on personal experiences with these company's would be great! Also thank you everyone for your responses.
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I ran reefer for 3 years and the best part was listening to the reefer and not even knowing you fell asleep. Have always wanted to give flatbed a try, got tired of trailer washes, unloading the trailer at times, unloading was no biggie, but when sitting at a distribution warehouse for hours was really starting to get to me. I am gonna try Primes flatbed division and if I don't like it, back to pulling reefer again.
Reefer:
A refrigerated trailer.
OWI:
Operating While Intoxicated