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[Weldman]

@Weldman Current tires are Firestone FR710 P205/65R15 92T M+S.
View attachment 110517

If I'm decoding right, that's 205 width, 65 aspect ratio on 15" rims. Any opinions on Carlisle or Heartland brand trailer tires? Goodyears at ~$180 each is out of budget. Local Discount Tire has these which I think are right size.
https://www.discounttire.com/buy-tires/carlisle-radial-trail-hd#treadwell-data
https://www.discounttire.com/buy-tires/hartland-st-radial/p/29484

Since you aren't living down this type of road those Carlisle or Heartland will be fine, after all they are ST tires that will help with less rub turning on tandem axle.
The correct size should be ST225/75 R15 or ST205/75 R15 that way if one blows you got more chance of finding a spare.
ST meaning Special Trailer which has stiffer sidewalls than the LT Light Truck tires or P for passenger car tires.