increase tire size

I know that the tires can not move any closer together and will normally never touch, but what if something gets kicked up by the front tire? There is no room for the object to pass between. I would worry about a catastrophic failure of possible both tires. I own a machine shop so it will not be difficult to machine a new spring equalizer that is eight inches on centers instead of my current one which is six inches. That, in addition two a mod to the two outside attach points for the springs, will put me back at the current 3.5 inch clearance. While I can do all the design and machining, I can't help wondering what other people are doing, or if it is just my trailer who has this narrow 33.5 inch axle spacing.