WCB,
two things you can do here, 1.) go to the hobby shop, and take the front gear with you, pick up a new front gear leg, but an 1 1/2"-2' longer, and of course the same dia.
2.) and the better option- go to the hobby shop, and pick up a set of wheels that are bigger. The Alpha will carry some more weight without a problem, if in doubt, get the Dave Brown foam wheels, they are light, and you can go a few sizes bigger without weight penalty.
A good idea with these, if you already haven't use loctite on the screws that hold the front gear to the firewall, they have a tendency to vibrate loose.

Jetts