Well, the WD is a lot cheaper than bags. Plus you can move the WD to another vehicle (a buddy or another family member) if you need to tow with that. My RV is just over the tongue rating for my F250 which is why I got the WD originally, but after using it, I pretty much use it for all bumper pulls. If the trailer is really light or empty, I may not put the spring bars on, but I will with a load. It moves some of the tongue load to your front axle by imparting a rotational force at the bumper. It does handle different on bumpy roads, but it feels more stable. Certainly feels less likely the trailer will try and pass you up.