My dad started an RV dealership in 1958
and had a 2 inch receiver and "Equalizer" brand torsion bar hitch installed at that time. I can recall that from his research he had always told his customers to stay away from axle mount hitches.
He always towed with the family sedan and traded vehicles at about 80,000 miles. It is interesting to know that none of his vehicles ever had a mechanical breakdown due to engine or transmission failures. He did prefere his 1964
Dodge 440 with a 313 ci engine.
Here is a list of the vehicle that he towed with.
Ford Fairlane ( 6 cyl manual trans.)
Ford Galaxie ( small 8 cyl. auto trans )
Dodge 440 ( 313 ci auto trans )
Chrysler Windsor (383ci auto trans)
1969 Chrysler Newport (383ci auto trans)
1972 Ford LTD (352ci auto trans)
Many of you may recall how popular the Chrysler products were because of the stable front suspensions that used torsion bars instead of coil springs. Back in the early 60's Richard Petty also praised the torsion bars on his Chrysler based Stock Cars.