here is some good info here

http://coloradok5.com/specs.shtml#1991

My rodeo has a Cherokee Cheif axle much wider than the wagoneers close to a fullsize chevy axle

I agree the wider axle can help you from rubbing with big tires and smaller lift.

94 Rodeo 3+3 lift Red)
95.5 Rodeo 1" Body lift Dana 44' front & rear 4.88 gears 35"s 176,000 miles Optima Yellow top InexAir Co2
front winch bumper custom rear bumper, Hella 500's
2004 Silverado duramax