TMT, I would talk to your local tag office and see what they will accept as a motorhome. At the very least, you will be removing the commercial hitch and replacing with a RV style fifth wheel. You will have an advantage over most as your ARI should be equipped with tanks, toilet, shower, kitchen and bed. If you don't have onboard power that will also accept shore power, you might want to add something that will work that way. That was one of the reasons that we went with a Carrier APU with the shore power option as I can either use the Carrier Generator for power or plug into shore power for heat and air.
There was another gentleman that contacted me several years ago with an ARI sleeper that his county would NOT register as a RV due to its being a commercial vehicle before. That is where your problems are going to rear their ugly head. If you can get it past the local tag office, you should be OK once it makes it to Atlanta.