Potential Road Hazard
We have just returned from a 3,900 mile roundtrip as newbie snowbirds. The FunFinder X-210 performed admirably. However, the roads, in certain areas, left a lot to be desired. Some metro areas experimented in the past with concrete low-wear road surfacing, which would purportedly save maintenance costs. This road construction came with expansion joints which are noticeably noisey. Out of the 3,900 miles, there was about 50 miles of this type construction, which was in less than good shape due to settlement, etc. This was most noticeable around the I-5 corridor in Tacoma, WA and the Sacramento and Stocton, CA area. There was also a section of HWY 99 around Bakersfield, CA. The rest of the time, the trailer performed well, tracking the truck in wind and rain.
My problem is that over a relatively wide range of speeds a harmonic vibration was set up, which was unsettling! I felt that some traction in the rear tires might have been lost, at times I also feared that the trailer coupler might come loose. I have experimented with acceleration, deceleration, and tow truck weight distribution. Changing speed helped for a time only to have this harmonic come back sometimes, at the new speed! Weighting up the back of the truck seems to have helped the most, but hasn't completely eliminated the vibration. My hitch weight distribution can not be adjusted as with chain tensioners.
This harmonic might be a function of the trailer and truck suspension as well as tow vehicle wheel base. However, I also towed this trailer with a Toyota 4Runner for awhile, and the same problem was exhibited. The 4Runner has a shorter wheel base and is a bit lighter.
I have checked the level of the trailer and vehicle hitch area and the fender to center hub distances on the tow vehicle hitched and unhitched. Camping World seems to have done their job.
Will air bags help? Anybody out there want to tackle this one? Thanks.