Just out of curriosity, I decided to check the Equal-I-zer website. There, the manufacturer suggests that the hitch is acceptable for boat trailers and trailers of all varieties -- there isn't any mention of minumum hitch weights. The page with this information can be found at:
Equal-i-zer® Hitch - Product Info - Compatibility
Equal-I-zer also has a link for questions, and it might be worthwhile to contact the manufacturer with your question to see what they have to say about particular weight ratings (that is how I finally obtained the information I needed prior to installing the Reese Dual Cam on my Minuet). The link for their technical contact is:
Equal-i-zer® Hitch - Support - Contact Us
I am inclined to believe that the Equal-I-zer may be a possible solution for your situation.
Good luck with your decision!
P.S.: As an added thought -- if your coach has a front mounted water tank that is still in place; traveling with it full may significantly increase your tongue weight.