I posted this in reply to another message. May benefit other 170 owners. Joe ............................... Hi Gball, Hope all's well. Reading your post I'd like to suggest your life will be easier if you reduced your tongue weight to no more than 10% of total weight if possible. The best I could acheive is still a little heavy...100lb. Put a bathroom scale on a chair to test with trailer level. You'll need to get an approx weight of boat & trailer...my 170 & Karavan is around 800-900 lbs. Truckstop scales on the highway will do if lacking specs. Next is to reduce by a combination of pushing boat rearward on trailer. Will require bunker and crutch adjustments etc when done. If like my standard package, probably won't be enough so next is positioning Trailer Axle forward. Loosen mounting U Bolt nuts and use a BFH to pound mounts forward-a little at a time each side-until around 10% at tongue. Too heavy (>10%) is a pain! and too light (<5%) causes trailer sway. as I said I had to settle with around 100lb as axle could not be moved forward enough. Much better than the 160lb I started with! One final note is wheel tracking. To ensure a straight true pull, hook up to your vehicle. Pour strips of water in front of the vehicle wheels and drive STRAIGHT over the water. Observe where the trailer tires track in relation to the vehicle. Acheive a symetrical-from-centerline position for straight true tracking by moving one side of axle forward or rearward as needed. Once done, you'll wish you did this a long time ago!