Kenjengrif, I tow a 24 feet HTT with a weight of about 4500# using my 2005 V8 LR3. I found that there is a significant difference in the sway behavior with or without the friction sway control bar. However, I am still not totally happy with the friction sway control system particularly when there are cross winds. I find I have to keep my speed at 50 mph or below to avoid the "white knuckle" driving experience.
I understand that even though the automatic air suspension system on the LR3 does a good job in leveling the traile/truck system, it does not tranfer part of the trailer weight to the front truck axle like what a WDH system does. With the help of some towing experts on the RV NET.com, I did a calculation and it showed that with my HTT hooked up to the truck, more than 790 lbs of load is added to the rear axle of my truck while the front axle is now about 220 lbs lighter. As a result of this change, the steering and handling of the truck could thus be adversly affected. This plus the other fact that the manual for the frcition sway control bar specifies that the bar should be removed when the road is wet make me want to seriously assess the possibility of using a WDH.
Like many others, I too have not been able to get a reasonable explanation from Land Rover on why we cannot use the WDH on LR3. After numerous attempts trying to find the right people from LR for help, the best I could get directly from LR was that they have not tested the WDH on this truck and therefore we should not use it (humm....). I have also heard from some people (not directly from LR) that a WDH system would interfere with the automatic air leveling system. The question I have is then there are many other trucks on the market that also have automatic air leveling systems, so how come there's no problem with these trucks with using the WDH? Again, I have not heard any reasonablle explanation to this.
So far I could only find two cases from people who have described their actual experience in using a WDH on LR3. The posting from FloridaLR here is apparently saying that after a short trial, he did feel it impacted the smoothness of his ride. However, another person said on the RV Net.com that he was getting great performance with a WDH on his LR3 after thousands of mile. So, what is the verdict? I welcome the comments from anyone.