Why do I need WD?

#1. It's VERY important to have as level of a TV and trailer as you can get while towing. This will prevent the trailer from lifting the front of the TV or dropping the front of the TV under hard braking.

Turtle,

Thanks. I did not want to get into this as it is not so much about WD as it is about loading but since you mentioned it I will share an experience I had about level trailers that are tandem or triple axles. Single axle trailers are perhaps slightly different in function but my tandem axle trailer has an interesting characteristic that I think is found on most tandem and triple axle trailers also. I changed out the cheap OEM bushings with wet bolts and the cheap equalizer between the axles with the Dexter EZ flex and weighed the axles. To no surprise one side of the axle is heavier than the other, usually the refer side or the slide out side. But what did surprise me was that one axle carried more load than the other even with the axle equalizers. Then I played around with the tongue position -- level, up an inch or so and then down an inch or so and watched the axle weights change even with the equalizer. To me this means that the equalizer does not really work that good and further that some tires are carrying more weight than others. This concerns me since even level the axles are not the same weight. But, the bigger issue is the tires. On mine the tires are rated for the load at what I consider 'just barely able' and to have one axle carrying more weight due to non level towing (or any other reason) can stress out the tires on the heavier axle and cause problems. Folks that are anal about tire pressures and wear probably never think about how much weight each tire is carrying both from a side to side axle issue as well as the axle itself not carrying equal weights. I don't think it would be easy to find the place where both axles carry the exact same weight but the tongue position sure changes the axle loading and I decided all the 'tow with the tongue slightly low' koolaid that has been spouted on these forums are from folks that never actually weighed their axles, and then what each tire on the axle is carrying. If they did they would quickly find a small change in tongue height makes a measurable change in axle loading.

It is no wonder anymore (at least with me) that tires fail, we blame the Chinese sometimes but what RVer really knows what each tire is carrying and if it is over the rated tire capacity? Then we blame the tire manufacturer for junk tires. Second, the trailer is often set up at the dealer with nothing in it, no water or stuff or supplies. Then the new owner goes home loads up all the stuff and water and hits the road. And the hitch is no longer correctly adjusted as it was never set up for a fully loaded trailer. Dealers would do the customers a big favor if they asked the customer to return when the trailer was fully loaded for camping for a hitch re-adjust. No wonder some have handling and tire problems.

A 7500 pound gross weight trailer with two 3500 pound axles is crazy. The tongue has to carry some weight or the trailer is over gross for the axles. And then four 1820 pound capacity tires carrying the load. There is almost no margin for one axle or tire carrying more than the others without something being over capacity.