Mountain driving and towing with a gas class A

I have driven from Detroit to California and back twice towing 4,000 pounds of Chevy Lumina APV plus whatever was in it (NOTE the 4K pounds is just the lumina)

With my Workhorse based Gasser, Chevy 8.1 Allison Works great.

Only time I had a problem was when I trusted my Maping software and it proved it's names.. Usually it takes me down Streets.. The mountain goat trail it routed me down was clearly a TRIP.

Sadly the APV.. Died of old age. Twice,