This is likely a potential problem in every state that allows homebrewing, excepting OR and CO and other states have added language in recent years.
It's probable that the right to homebrew is a mere one or two line clause that exempts taxation. And that's it.
It likely uses language such as "in the home", "for home purposes".
It undoubtedly says nothing about transportation or use outside of the home.
This leaves these questions wide open to your state's alcohol control board or department of liquor control or an overreaching department of health. These are all appointed positions with little oversight or direction.
Right or wrong, they make decisions that are binding without any recourse until after the fact. By this I mean, they bust up your homebrew competition and you're screwed. You may ultimately prevail at some hearing, but your actual comp is over.
This is why it is important to join a club; have that club communicate with the professional brewers guild and the AHA and the DLLC/ACB. In many cases you can get these things cleared up and get some legal precedent and policies in place.
The other longer term option is to get some meaningful and favorable laws passed, but bear in mind that you risk opening up the entire law guaranteeing homebrewing. It's not entirely impossible (especially in my wacky state) that some grandstanding state legislator decides to ****can the whole exemption once they find out you can brew 200 gallons of the debbil juice. Plan on a ridiculous amount of education and PR.