This isn't a suspension fork. It's just a triple tree fork.Yeah, you definitely want to keep your spacing proper with a suspension fork. They don't like to be on axles with O.L.D. much narrower or wider than the fork, and as you've seen, will bind the fork right up. I encountered that myself, and had to adjust the spacing on my Sturmey front hub for my RockShox.
O.L.D @ Sheldon:
If the axle isn't long enough to go past the dropouts than you need a longer axle and it needs to be spaced to the proper O.L.D. Thought those mags had wide spacing for fat tire bikes?