Your idea is a/can be a / great idea....
You have the whole wide range of requirements out there...Some carriers want you to have everything...In which case you usually make more
Some carriers cover dang near everything, but you make less...
My experience is in LTL....Central Trans, Saia...If you brought your own truck, they covered almost everything...You made double company driver pay..2200 to 2700 a week taking that route..L/O is pretty safe...But straight O/O bookin yer own stuff off the loadboards seems pretty cool too!! I havent done it, but for about a year now, I'll pull up load boards for giggles..In my town, Tucson, 500k population, theres usually 7 to 10 trailers waiting to be hooked at all times, thats just 53's with an average weight of 34k....the cheap loads...I would assume I could take one to chicago, and just as easily find a trailer there goin back where i came from...rinse and repeat all day long...Just keep a laptop handy!!
So many directions you can go...Me, I like money....Id pull crude out of ND, heavy haul etc etc...