I was thinking of ordering this:

Tekin RX8/Redline T8 1/8th Scale Buggy Brushless ESC/Motor Combo (2050kV)

But drop it in my 1/10th Truck. Just the ESC hooked up to my current 1/10th Sensored motors replacing my Losi 9500 ESC.

I have been thinking of going 1/8th Electric in the future, and figured I could move the 1 ESC back and forth between vehicles as needed. As I would run 1/8th, or 13.5T Truck, but likely not both the same day.......

I had a mamba monster in a rustler at one time so I dont see why not.

it depends on witch car you use it in... the RX8 WILL NOT fit in a t4/b4 without some mods...

Going in my Losi Truck, but the ESC is not in the standard location anyways due to mid-motor, so I have room.

No problems with using it. You'll have one nice cold ESC, no worries about blowing it.