I have the same trailer (20XPT) and am forced once again to to get two or three new tires in the morning. I have an entirely different issue with my daytons and and obvious alignment issue. I've bought several tires in less than two years. Maybe 8 or 10. As far as your load it looks pretty balanced to me, maybe a bit forward. You might be able to back up six inches, but track loaders are heavy in the rear. I think those 17" low profiles just run hot. Probably just a unlucky thing to lose two tires.
I can atest that heat will blow those tires. Five years ago as an employee pulling a 20 ton tag with a 15 ton excavator. I was alerted by a guy on foot at a red light that my rear brake was on fire. (the mechanic had just adjusted). So I pull into the immediate parking lot and find the the trailer brake drum glowing orange with flames. This is where I made a near fatal mistake. I waited about 5 or 10 minutes and grabbed a wrench and slid under the trailer. As I was slithering on my back up to the slack adjuster the inner tire exploded. I cannot describe that impact. I just rememberd being covered in dirt and my ears were ringing and I couldn't hear or see hardly from all the dirt that got shocked off the trailer. The tire exploded at the inner top and all the of the impact hit the I beam of the trailer. I could have been killed or severly injured me. They bought me a new rig and I put the machine on it and went to work. When I got back to the shop, the trailer was jacked up with the blowout removed. I saw first hand at the damage that tire did to the I-beam. It was pitted pretty good. It was a new tire. Just amazing the pressure to explode a tire of that strength that is new. I forget the term used when a tire blows soley from heat but it is a fitting and interesting word.
I can atest that heat will blow those tires. Five years ago as an employee pulling a 20 ton tag with a 15 ton excavator. I was alerted by a guy on foot at a red light that my rear brake was on fire. (the mechanic had just adjusted). So I pull into the immediate parking lot and find the the trailer brake drum glowing orange with flames. This is where I made a near fatal mistake. I waited about 5 or 10 minutes and grabbed a wrench and slid under the trailer. As I was slithering on my back up to the slack adjuster the inner tire exploded. I cannot describe that impact. I just rememberd being covered in dirt and my ears were ringing and I couldn't hear or see hardly from all the dirt that got shocked off the trailer. The tire exploded at the inner top and all the of the impact hit the I beam of the trailer. I could have been killed or severly injured me. They bought me a new rig and I put the machine on it and went to work. When I got back to the shop, the trailer was jacked up with the blowout removed. I saw first hand at the damage that tire did to the I-beam. It was pitted pretty good. It was a new tire. Just amazing the pressure to explode a tire of that strength that is new. I forget the term used when a tire blows soley from heat but it is a fitting and interesting word.