Do you have the owner's books that came with the coach? My chassis information came in a 3" binder labeled Spartan. Section 3, in my manual, has the information asked for in the OP. If you do not have the manual, consider contacting Spartan at 800-543-4277.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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