I did finally break down and buy an Axial Deadbolt RTR. It was almost new, literally barely run.
So I got to give my little truck a real test. I put it up against the Deadbolt climbing some rocks at Flat Rock Park in Columbus, GA
It did AWESOME, it climbed almost everything the Axial Deadbolt did.
There were a few spots where the tires lost grip but I'm willing to bet that if I had swapped tires it would have made it further. The Deadbolt was running Proline TSL Super Swamper 1.9 tires with the G8 compound and those stick like crazy.
Afterwards I did some serious swamp running with it back at our campground.