One of these days, I'll report on our trip from California to Tennessee in 1980- - - - -with me driving a 1970 Cadillac Fleetwood Brougham I borrowed from Dad, and towing an 18 foot backhoe trailer with three (count 'em!) mobile home axles. Mary was following me, driving the 59 Burb that's still parked out behind the barn, and towing a Datsun station wagon. The Caddy and trailer weighed 16,700 pounds when I bought an "over-wide" permit because of the 100" wide trailer axles at the Arizona border. The Cadillac got 5 MPG for 2500 miles, California to Tennessee,- - - -and the Burb got 10!
Jerry