Re: Equal-i-zer head identification

I've never heard of a 4,000lb Equal-i-zer hitch. A call to Progress mfg will probably answer your questions though. I imagine they will ask you to measure the size of the square sockets as I believe they use different size bars and therefore different size sockets for the different ratings.

Phone: 801-377-9599
Toll Free: 800-478-5578

Mail: Progress Mfg. Inc.
533 S. 500 W.
Provo, UT 84601
USA

Email: info@progressmfg.com