You are on the fence, but personally, and I own a F150 and just a bit more trailer than you, I have a WDH, and hands down, like it. Disappointingly, F150s are a bit sluggish with the shocks and WDH will tighten the whole line as well, and anti-sway will help in windy conditions. My 2 cents, you will absolutely prefer it. Most dealers do a poor job installing them correctly it seems; if you are handy and a DIY guy, for sure do it yourself.
edit: but as Roy suggested, try it without. Measure your front fenders height prior to connecting to trailer, level, in resting position. If it raises more than 1 inch after connected you certainly want wdh. After I connect, by rear end sags maybe 2 inches and after wdh, my front end is within 1/2 inch of original resting position.