If your current WDH could accomodate a Dual-Cam add-on kit, I'd go that way to save money.
Otherwise, if you are getting an all-new kit, it really seems like the Equal-i-zer is easier to engage each time, and has a large following.
I'm just in the process of setting up my Equal-i-zer, and probably need a longer shank than stock. See my recent thread in "Towing".
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller