Woody- Glad you got it apart. If you think about torching on a rim with a tire mounted on it ( as was suggested to you by Mr. Trailer Store) and the resulting higher pressures involved inside the tire, you might think twice about ever going that route.
Living in a climate where they salt the heck out of the roads in the winter
( right , Security?)
what I do is when I have any, and I mean any, wheel off a trailer or vehicle I apply a real light coating of Never- Seize on the lugs/ studs and then also on the contact face of the drum, rotor or hub. Just be sure not to get any on the braking surface
Security- I suggested this Never - Seize remedy to my friend, whose BMW is the same way as yours, rims always got seized on . He no longer has to beat on his nice wheels to remove them