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If you keep your stock lunette ring and use an electric-hydraulic actuator, you can back up all you want, the brakes won't apply until you depress your truck's brake pedal. No lockouts needed with a non-surge lunette & electric-hydraulic actuator.

Get a surge brake coupler with a Lockout (to allow backing without applying brakes).

That's it! It works well and is plenty strong for converting an M105 trailer at a reasonable cost.

Electric over hydraulic actuators are expensive, but effective. I welded on some brackets to my M105A2 so I could bolt on a DICO Aero surge hitch with 2-inch coupler; the hitch unbolts and will set in a cradle I still need to install on top of the tongue, so if I want to reinstall the lunette...

You could weld/bolt on a surge brake coupler, remove the air lines, and run the brakes as straight hydraulic. Surge brake couplers can even be obtained with lunette eyes. That way you could tow it with any 3/4-ton or larger vehicle.