My Harley Electraglide valve stems are a pain to access. I have to remove the right side saddle bag and move the bike to just the right spot to get my gauge and air chuck in to check and add air to the rear tire. Since Nitrogen is more stable and my bike sits for weeks at a time in the winter, I'm wondering if anybody has used Nitrogen in they're motorcycle tires and how expensive it is to fill 2 tires. Thanks