Need Physical Address without living anywhere

Hello everyone,
I'm new to the trucking industry and running into some issues I didnt expect to be so difficult to get sorted out. I dropped my apartment and everything to come out on the road. OTR is where I am and where I want to be. Currently I have no home and honestly I'd like to keep it that way. No sense in paying rent anywhere I'm not going to be.
This is where I'm at.
I need to get my CDL switched over to a new state as well as establish a base for tax purposes.
I'm targeting states with no state income tax of course to save that bit of money.
Ive looked into a couple of options for establishing a physical address without actually living anywhere but I'm not sure they'll fit the bill.
USPS offers a street address in place of a po box but I'm not sure they will work for the purpose of proof of residency for the drivers license or tax purposes. I'm sure i'm not the only guy out there that lives on the road. I was hoping someone might have some experience dealing with this issue and/or some advice to help me figure it out. Thanks in advance drivers,
Hammer Down.

P.S. I dont really have anyone anywhere that would let me use their address, maybe in my home state of Pennsylvania but then I'd be stuck paying piles of state and local taxes.

 

I probably will do that actually but ive just started out. Still on my training wages. That'll be down the road a year or two for sure but ive only got 90 days to get this license switched over, give or take.

 

Update:
Just found an old girlfriend who'll let me use her address in FLA, says she'll write me a letter stating that I live there as well. Hopefully that along with a bank statement will be enough to satisfy dmv requirements

 

Thats just the thing i was looking for, most excellant. Thank You