These spacers very thin aluminum maybe 1/4" that went in between inner wheel and outer wheel just that much added considerable stress on the lugs towing heavy causing them to snap off both sides.If you buy the proper spacers you can tow the same.
All duallys have factory spacers in the front btw
Mine never has had. Wheels fit right against the pilot ring and hub face retained by free spinning flange face style lug nuts. Rockwell wheels which are OEM to the truck I purchased new.All pickup duallys have factory spacers on the front