Hi Kevin there is a very good chance the frame won't last, as you know there 40 to 51 years old, age and road stress will have taken its toll, and so would the torsion
axle, We are just doing a run of three 1300
Boler frames $2700.00, so they come with some nice features,like a rear tire mount, 2x 2 bike rack ready sleeve, a 2200 pound fully adjustable torsion axle 2" a coupler, h/d safety chains with quick release hooks, a quality tongue jack plus some better mounting points that are not drilled through the frame. Something to think about before buying used.
Joe