“I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question. -Babbage (1864)”
You may enter any state and submit an absentee ballot for your voting district from wherever you are. You do not lose your right to vote outright just because you are not in your jurisdiction; you retain that right as regulated and standardized by federal law. There is no need for you to re-file voter paperwork subject to the non-resident location you’re in. (I imagine someday, when legislation catches up with technology, you’ll be able to walk into any polling station (or, heck, use your smartphone or some such) and cast a valid ballot which will be filed with your home jurisdiction. The exact local protocol may differ from one location to another, but the final outcome will be as though you voted at your current assigned location.)
Likewise, you shouldn’t lose your RKBA just because you haven’t filed paperwork in the jurisdiction you happen to be in outside of your normal residency. For most jurisdictions now, the only barrier to legal CCW is lack of “full faith and credit”, to wit you’ve gone thru the same process at home (background check, fee paid, ID card issued).
Better analogy is losing your right to drive just because you went to another state and don’t have a driver’s license issued there.
This is not true. Requirements for PTC are different in each state. Why should someone from one state who requires no training to get a PTC be allowed to carry in a state that has stringent training requirements? Either the states have authority to place reasonable restrictions on the 2nd Amendment, like SCOTUS has said, or they don't. If the federal government can dictate to the states what those restrictions can be, the 10th Amendment and the SCOTUS decisions are meaningless.