I have towed a 12,000# enclosed trailer trailer with a WD hitch. It had a 1500# tongue weight and my hitch was rated to tow a 15,000# w/1500# dead weight. I used a WD hitch and felt that it was more stable and put less stress on everything when hitting those sudden dips in the road. It also had a sway control feature with it. I currently tow an 8,000# open trailer w/o a WD hitch and I can't say there is any difference. I think the reason is that the coach weighs 40,000#, so the added trailer weight can not have a big impact on the overall handling. My son tows a 26' enclosed trailer weighing 14,000# with a 2,000# tongue weight w/o a WD hitch. His coach weighs 60,000#, so the added trailer weight is not a big factor either. Our coaches have tag axles which will more easily handle heavy tongue weights. Your single axle 40'er would probably benefit from a load distributing hitch more that ours did.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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