I agree that this is a problem, but I think it is less equal protection that interstate transfer as the issue.
My twin brother and I are in Utah under the proposed law. He resides in Utah, and I don’t.
A cop stops us, learns we are both carrying and proceeds to arrest us both. We are tried for a same crime, but the judge immediately dismisses the case against my brother, but I am convicted and sent to prison.
If it helps, we each co-own the two houses we live in, and he lives in the Utah home 183 days a year, while I live there 182, and we then switch (we have different seasonal climate preferences). Maybe I spend even more time in Utah on business, but make the arbitrary choice to designate Nevada as my legal state of residence.
I truly don’t think this is an issue this time, because Rep. Carl Wimmer, is perhaps Utah’s biggest 10th Amendment advocate and about as pro gun rights as they’ve got.
“More than 250,000 people have sought a Utah permit since it began issuing them in 1995, though, especially in recent years, most have been issued to people living outside Utah because its permit is honored in 32 states.”
That is, Utah has essentially been “exporting” permits, with citizens of other States traveling to Utah to get gun permits that would be recognized in their home State.
http://www.ehow.com/how_4818288_utah-carry-permit-valid-states.html
“To get a concealed firearm permit from Utah you do not need to be a Utah resident.”