Forum Discussion

Dano1955's avatar
Dano1955
Explorer
May 26, 2016

Need some opinions on pin weight effects for....

...what I want to do.

1st the specs on my 5ver (signature).

Pin weight 1279
gvw 10079
dry 7990
cargo 2530

What I intend:

Hitch receiver on the back (weight 150 approx). The entire install is 2" receiver, welded to 2" tubing welded to brackets on both sides that are then welded to frame and the rear bumper. 1000 lbs estimated capacity.

To that receiver will be attached a bike (motorcycle) carrier 100 lbs, which will carry a small 124cc bike 250 lbs.

Welded on the back bumper will be a box built with slide outs that will contain my generator/converter. Box and generator approx. 120 lbs. The bumper is reinforced by the hitch receiver installation, they are welded and now are one unit, increasing the bumper weight carrying capacity.

A friend of mine is helping with this and assures me that there should be no problems with it. He works for, and has for 30 years, a trailer repair/build facility and has dealt with everything from small utilties, TT's and 5vers, all the way up to 18 wheelers (his primary business), flat beds, box trailers the works, and all hitch types and classes.

I have a concern though that with 700-800 lbs hanging off the back of my Crusader LITE that it's going to adversly affect my pin weight, specifically, create a light pin condition.

I trust my friend, but I also trust my Dr. and always get a second opinion on anything serious, so that's what I'm looking for here.

Anyone want to offer one?

TIA for your time.
  • You are starting off with a very light pin weight to trailer weight percentage
    Dry weight 7990----dry pin 1279======16%
    GVWR 10,000------16% ===== 1600

    5th wheels tow more stable, less chucking when pin weight percentage is 20-25%

    With 700# hanging off back you will lighten pin by roughly 280#
    With 800 hanging off back -----320#


    You think you have issues before (your other post about 5vr pushing) wait til you unload that pin weight and have all that extra weight hanging 32' behind you.
    Tail wagging the dog and enough 'chucking' to beat the band.

    Thought the idea of a TH was to have a garage for the toys....not hang them off back :H

    I won't comment more least words/ideas not expressed end up being attributed to me
  • rhagfo wrote:
    That is a lot of weight to be hanging off the back of that small 5er, you are placing about 10 percent of the dry weight off the rear.
    Will reduce pin by likely up to 400# (the axles are not a perfect fulcrum), and place a lot of rear of the axle making the 5er subject to sway induced by a heavy weight rear of the axles.


    I tend to agree. In talking to our "trailer guy", he had added a swivel wheel setup to one of his customer's FWs and he hated it. Ended up taking it off after only 1 or 2 trips because the FW was so unstable.

    Second thing that occurs to me is whether you =replaced= the OEM bumper tube or just braced it. Even with bracing, the OEM bumper still might be too light and weak for what you're trying to do. Again, JMO...

    Lyle
  • I would not worry. Maybe 30% of that weight will come off the pin. I would worry more about the frame itself and a good install should take care of that. Keep the rear holding tanks empty when you can to reduce the worry.
  • rhagfo's avatar
    rhagfo
    Explorer III
    That is a lot of weight to be hanging off the back of that small 5er, you are placing about 10 percent of the dry weight off the rear.
    Will reduce pin by likely up to 400# (the axles are not a perfect fulcrum), and place a lot of rear of the axle making the 5er subject to sway induced by a heavy weight rear of the axles.