Proline makes a bunch of 40 series tires. That sort of style are you looking for. You could run maximizer bead locks if you want to run badlands.
Here is a link to all the proline tires
http://www.pro-lineracing.com/produc...egory=mt_tires.
Savage: FLM Conversion, 6s, MMM, CC 1520.
Mini-T Pro: Micro Pro 6800kv, Lipo, HS-81mg, Dirt Hawgs
M18MT: Quark 33A, Y22S 6000kv, FP 2s Lipo
LRP S8-BX: RC-M Conversion, Tekin RX8 B1600KV, 6S.