OK, so here's the plan:
Found Goodyear Marathon ST205/75R14's, WheelWorks has them in the warehouse, and I have an appointment for next Friday at 0730.
WheelWorks will match best price I find locally between now and installation.
I will feel much safer once I'm no longer running on 12 year old tires!
Thanks for all your help.
Note: Weight correction mentioned earlier was from NADA online. Spec sheet inside trailer states: UVW 4,551 lbs. ^Trailer is double axle.
Now to start treating the trailer as a restoration hobby and make it worthy of SNOB resorts in spite of it's age.