Forum Discussion

smsage999's avatar
smsage999
Explorer
Feb 21, 2018

suspension problems

Okay, so I will try to make this as short and to the point as I possibly can.
I recently purchased a used 2013 Forest River XLR Thunderbolt fifth wheel toy hauler. I must say it is a massive upgrade from my previous keystone Cougar 320 SRX.

Went on my first trip a month or so ago, and noticed the coach leaning significantly to the curbside. Not so much that I felt unsafe so i pushed on to the house (3 hours), and immediately got my creeper out and went under the unit. All I can say is WOW, the leaf springs on the curbside were a straight line and the roadside were not much better. Counting the leafs, I determined through lots of research on this forum and others, that these springs were only rated to a max f 2250 lbs, which is not enough to carry the empty weight of the coach, much less the GVWR of 18,000 lbs. So I immediately ordered springs rated for 3400 lbs each and replaced the springs and all bolts. This raised the coach almost 7 inches!!! I was happy for that, now I tow more level which eases my mind on tire wear.

Fast forward to this past weekend. the DW and I went on a trip to north-central Texas (6 hrs away) and I noticed about the halfway point (also when daylight was good), when the coach hit a bump in the road, I would see a puff of smoke come out from under the wheels. So I pulled over and noticed the spacing between the middle and rear axle was only about 1/4 inch, while the spacing between the front and middle axle was 2 inches minimum. Again, I pushed through stopping regularly to check wear and temperature. Fortunately no tire damage as the tires only made contact with each other a handful of times, but I began the "kicking myself" wondering how I missed this issue before I changed the springs, then tonight it hit me. with the flattened springs, the axles were pushed further apart, and now with proper springs, they are pulled together.
So moments ago, I went and took some measurements, and cannot believe what I am seeing.

The axle spacing from front to middle axle is 34 inches on center, with the equalizer measuring 7 inches eye-to-eye.

The axle spacing from the middle axle to the rear is only 31 inches on center, with the equalizer only measuring 5-3/4 inches eye-to-eye.


can someone help me figure out why this is? Was looking to get the ez-flex equalizers, with wet bolts, but hell, the measurements are so funky, I don't know which size I need to buy.

Please help, I have a very long trip to Tennessee coming up soon.

43 Replies

  • I think you need to get off here and on the phone to Forest River and find out why the dimensions are different. :) It certainly sounds like it was manufactured that way, but the question is why. Forrest River may have the answer. I've always assumed that the spacing on axles was equal, but maybe not.

    Are the tires the original size? Perhaps larger diameter tires/wheels have been installed at some point. What may have been marginal clearance with OEM tires may be insufficient clearance with aftermarket sizes.
  • Hard to diagnose without more info. Is the spacing the same on both sides? I wonder if you have a bent hanger, failed equalizer, another broken spring or somethin of that sort. We had a spring break at the connector last year and a casual look didn't alert me as I saw no parts hangin. But I noted the wheels on one side were much closer together. Turned out the rear spring had broken right after the hanger. At rest it looked fine other than the wheels on that side were closer together? I know once we moved it'd have been obvious.

    I wound up replacing all the springs and the equalizers. We now have 28,000 miles on the rig and things look good. Good luck!
  • Wow, 7"?
    That's phenomenal.
    It amazes me where RV builders save a few bucks. My own TT really needs the next size up of axles (6K vs 5200) and the difference in price for them probably would have only been $40 or less.