I was stuck in a similar spot on a narrow shoulder, but my blowout was the passenger front, so my arse was in the ditch---literally--- not on the traffic side! At least it wasn't raining!
Check the equalizers, shackles, and spring bushings on the trailer suspension too when you have time. The cheap plastic bushings that OEMs use wear out and in my case the passenger side equalizer was also rusted into place and couldn't articulate. Because the equalizer couldn't move and distribute the weight equally on the two passenger side tires, it was overloading the front and caused it to blow. I caught that same position tire with a bubble in it the second time before it had a chance to blow on the road, that's what made me start looking at the suspension./