Shipmate,
The first thing you should know is it is far more complicated to become a commercial hauler than you might assume. It takes much more than simply owning a diesel powered truck.
There are two fundamental ways to go:
1) Lease your truck to a company who has customers, operating authority, commercial liability insurance, etc. and will dispatch (and pay) you. That company will provide you with operating authority and may, or may not, provide you with commercial liability insurance.
2) Obtain your own DOT authority and your own $1,000,000 commercial liability insurance and seek your own customers.
Either way you will be required to comply with all DOT regulations including keeping a daily driver's log book and complying with DOT hours of service rules, commercial truck inspection, fire extinguisher, reflective triangles, stop at all scales, comply with weight limits, have and carry a current driver's physical medical card, and more such as participating in a random drug testing program similar to the one the Navy uses.
If you are thinking of hauling RV trailers for hire start by contacting one of the commercial transport companies you find on the internet. You can find many of them by keying in the words: "rv transport" into your search engine.
I'd be surprised if the Seabees are going to allow you to wander the nation hauling loads while on active duty.
Harvey Barlow
MCPO(SS), USN, (retired)
PS
In internet custom it is considered a sign of anger and very rude to keyboard in all capital letters.