It's why National reciprocity is important.
Heck, if I want to travel from my home state of Washington into Oregon to visit friends, I have to unload and store my handgun as Oregon doesn't have reciprocity with adjoining state Washington.
It's insane!
We spend winters in CA (I inherited the ranch out there and capital gains are worth more than I can get for it if I sold it) and every trip there is a stop at either Mesquite, NV or Eherenberg, AZ to unload and store. I hate it.