The folks were likely recommending that you go to Light
because of the stiffer side wall as well as added weight
Flexing sidewalls can contribute to sway of the TV and can be passed along to the trailer, which in turn may begin to sway and pass that sway back to the TV.
Sway can multiply real fast. Also be sure your trailer tires have stiff sidewalls for the same reason.
WDHs are a controversy all their own. While they do help to lift the rear of the TV, they also cause a lot of stress on the frame of the TV as well as the tongue of the trailer. I suspect your Escape is a un-ibody design with no separate frame, as are most front wheel drive vehicles.
It won't take as much "Stress" as a vehicle with separate frame.
If the rear of the Escape "sags", I would personally look into beefing up the rear suspension, rather than using a WDH.
FWIW, a WDH came with our 03 Casita
. I weighed all the components.
is 70 lbs. That is an additional 70 lbs to tow around. We don't use it.
But thats just my opinion. A lot of folks use WDHs with uni-body mini vans and "seem" to have no problems. But I have read of occasional problems with the TV or the trailer tongue from using a WDH..
Whatever you do, be sure to keep the trailer in good balance. At least 10% (more is better) of the total weight on the hitch. Moving weight to the rear of the trailer to lighten the hitch weight is inviting disaster.