I'll see if I can help. However I cannot exactly figure out the issue from your description. Let's see if we can clear some things up.
Is the front jack dragging or the rear? You said you increased the spring tension and it made it clear. This sound like the front.
You are having problem snapping up the bars and you have jacked the TT and TV way up. This sounds like you may have some hitch setup issues. Let's see.
What size WD bars do you have? (What rating are they)
What brand WD hitch do you have?
And you said: "Told me that i needed to hook the chain on the weight bars to the forth link. Was using the third. "
I do not know if you are referring to the number of links under tension or the number of dangling free links. How many chain links under tension did you adjust it to and how many under tension did you have it at before?
You should not have to strain that hard to snap up. If you are, yes it is dangerous. You may be fighting a WD hitch setup issue or maybe a technique issue.
If the bar is really straining, it may be too light for the tongue weight. Meaning using a 800# rated bar on a 1,100# tongue.
Have you ever weighed the TT tongue?
I looked up your 99, T2990. It listed 740# dry tongue with a dry GVW of 4,915. And it has a 7,000# GVWR.
Hímm also, tell us about the TV and what is loaded in the back of the truck aft of the rear axle? A bunch of fire wood or other camping supplies? The WD bars have to also lift the cargo in the TV aft of the rear axle. Need to know what you have back there.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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