What size wheels are you using? A good wheel I've run across lately has been the Dico 4" 1/4"width. These dico wheels for some reason load very well and I'm partly sure its because of the width. The only problem with the dico wheels is they can be tough to find. Typically you will find in mom and pop hardwares or ace hardware. Learning to load wheels is all trial an error...eventually you'll figure out.