My waggy measured out at 60.5" stock, and 62" with f150 hubs to convert it to 5lug. At 60.5" it was noticably narrower than the rear. The steering was crap with 2.5" BS 8" wheels, so I would guess it to be the same when using spacers.

I am wide now with a 69.5" axle and 14.5" tires on 10" wheels with 4" BS. I would think a 63-65" front axle would be perfect on the trooper.