RE: Caster F8T with Baja 5T tires
Curious. What are you trying to accomplish as the goal?
There are larger monster truck style wheels and tires available that are 17mm and will probably be slightly lighter. The Baja wheels and tires are heavier, but the Caster Fusion should be able to move it no problem. Drag racing, it will be somewhat slower, but you will gain top speed.
Just keep an eye on your motor and esc temps as it will create more of a load.