The problems and complications of owning firearms in multiple states comes up in forums like Quora many times.
https://www.quora.com/Can-you-have-more-than-one-gun-permit-for-two-different-states#:~:text=Yes.,recognize%20only%20their%20own%20licenses.
I do not know if there are any clear answers. Like many of you, I reside in HI, have a hunting license, and have permits for numerous handguns, and have registered all weapons in the state. However we don't have medium to long distance rifle ranges, and the appropriate training courses. These are some ideas I have considered for owning a residence in another state. Have your wife or "legal" partner become a resident of the second state. That means she is registered to vote in that state. This solves the problem of having valid permits outside HI. Storage is a worry both in-state or out-of-state, which suggest that a business with an FFL could open with long-term-storage in mind. Such a business would have walk-in vaults with 24-hr surveillance. The business model would price storage at a reasonable price, say, $100/month for five rifles. I am not a fan of carrying two rifle cases through an airport with one or two suitcases. Also do not like renting a rifle or pistol that can misfire, and possibly injure the user.
The Quora article you linked is about concealed carry permits and state reciprocity. It has nothing about "problems and complications of owning firearms in multiple states."
I think you're doing what you normally do ... complicating a problem that rarely occurs, if ever.
There can be no "clear answers" when the problem is not clearly defined.
What does being a registered voter have to do with firearm ownership? Either you are a LEGAL RESIDENT of the state, or you are not. It's a binary proposition. Unless you spend 180 days per year in two states, you are the resident of ONE state. Exceptions exist for military, but I don't think that applies to you, does it?
"Permits" in the context of your source are for concealed carry, not firearm ownership.
There are companies advertising in other states for short and long term firearm storage. It's increasing in demand as laws are passed that can result in confiscation: domestic abuse cases, mental healthcare treatment/counseling, red flag laws, inheritances, etc. These places offer storage to avoid having to hand your guns over to the state, then jump through dozens of hoops to get them returned. In the meantime, you are unprotected.
One I found in Colorado offers discounts for multiple firearms. AGAIN, how many guns are you talking about leaving unattended? How frequently are you planning to use them for "vacationing?"
Rental guns are no more apt to "misfire" than your own guns. In fact, I'd lean toward a gun that's been used more as being more reliable. Any problems were already identified and fixed. It's been routinely cleaned and maintained by professionals working at the range. Your guns are only under your own control. Unless you have more expertise and experience with guns than your previous posts indicate, I would not trust your guns over a range rental.
BTW, a misfire doesn't injure anyone unless it causes a squib, and then it's not dangerous unless you fire again without clearing it. That's usually the fault of the ammo, not the firearn.
Look up "misfire." It's usually defined as a failure of the cartridge to fire, as in the primer failed to cause the gunpowder to ignite. That's not dangerous.