get a WDH that functions exactly the same as the Reese which Ray cited, but pay about $78 less. I used this model for 3 yrs. Worked very, very well. It's made by Quality S, Phoenix, AZ, and can be seen here:
http://www.mooretruckaccessories.com...tribution.html
The standard adjustable hitch. I used the 750 lb unit for my 2720SL.
Heres a PDF of the installation instructions:
http://www.quality-s.com/PDF/wdh1002a.pdf
Denny_A