I was thinking - yeah dangerous - the other day about getting a flat on one of these contraptions. I figure it'd be a major PTIA to try and fix it on the road, dealing with 2 chains & sprockets. I'd most likely just call management and have her come with the truck and tear it down back at the ranch. I guess this is a reason (if the SBP guys haven't pushed it already) to use a jack shaft kit for just such occasions. Anyway, What have you done when you've gotten a flat?