Correct about the tires sizes back in the day. RC4WD Mud Thrashers aren't much bigger than the MTRs and look more era appropriate as well as not as aggressive looking.
Licensed Goodyear Wrangler MT/R 1.55" Scale Tires
https://store.rc4wd.com/RC4WD-Goodyear-Wrangler-MTR-155-Scale-Tires_p_5652.html
Advanced X2S³ Compound
Outer Diameter: 3.54in / 90mm
Width: 1.48in / 37.69mm
Inner Diameter: 1.42in / 36mm
Each Tire Weight: 1.71oz / 48.6g
MUD THRASHERS 1.55" SCALE TIRES, looks like BFG Mud-Terrains to me and they feel like decent traction just dragging them across my work bench.
https://store.rc4wd.com/Mud-Thrashers-155-Scale-Tires_p_219.html
Outer Diameter: 3.67" (93.3mm)
Width: 1.39" (35.4mm)
Inner Diameter: 1.55" (39mm)
Advanced X3 Compound
Each Tire Weight: 2.35 oz / 67 g
I'm not a fan of Mud Thrashers. The tread pattern is a nice, generic A/T tire, but the compound is too hard for my liking.
I'll keep pondering. Might even consider 1.9 wheels for the Blazer body. It depends on which one I stick with.
I forgot RC4WD made it difficult to switch from the Yota to the Blazer body. You have to install extra mounts for the Blazer body.