Does anyone make?
 

Does anyone make a front stub axle for a T4 that allows the use of XXXT wheels?

check Lunsford Racing they might have them.

The xxx steering hub and axle can be fitted onto the b4 front end by drilling the hub for a slightly larger pin.

I would guess the truck could be modded up in the same way but you would need to check the front track and also see how the steering geometry is affected.