I believe there are three track gauge models denoted by XL (narrow gauge), XW (mid width gauge) and, LGP which are the really wide tracks. I used to see a lot of broken bolts in wider gauge tractors using wide pads and working in any type of rock at all. What generally went with that is a big reduction in track chain life as well. Usually broken pad bolts happen when pieces of rock get stuck on the edges of the pads forcing them apart as they move through the bend at the sprocket or idler. I've seen plenty of issues as well when the initial installation of the pads wasn't done properly. Paint not cleaned off, bolts not cleaned before installation or the bolts and nuts not torqued up properly. Salt can also have a lot to do with it but in my experience there is a big reduction in the bolt head size from corrosion before they actually break. Usually the bolts that haven't broken will take a half size smaller socket in order to get enough grip to turn them loose.