I've driven more miles without a WD than I have with. Reality is as noted by some. If you remove too much wt off the front axel, such that steering etc becomes and issue, then you need a WD system to put the lost wt back onto the front axel. I've personally found that for typical 8 lug rigs with 8600-9900 gvwr's, that number is about 200-250 lbs. I took all of 60 lbs off the FA of my 96 CC with a 24' trailer that had 650-700 lbs of HW depending upon how it was loaded. I really noticed no difference in handling with or with out per say.
WHERE I did notice using a WD with the two trucks I towed the trailer with, was cross winds. The trailer did not rock sideways as much with a WD, a bit less when I went to a dual cam setup. NONE of the three ways I have towed my old TT did I have fishtail sway in higher winds etc. I found if I got a wind gust above 40, once in the 60 mph range going across the Columbia river, the whole unit move a lane sideways one time. Semi's were moving a lane sideways that trip across on I 205. An interesting trip across the river........
So yes, I would recommend a WD or dual cam with your trailer, but is it REALLY needed......more than likely not. But until you weigh or measure things as Don AKA burbman pointed out, you will not know for sure.
Marty