Why is it....

Discussion in 'The Other Stuff' started by Daisy on my toe, Nov 6, 2017.

  1. Daisy on my toe

    Daisy on my toe Active Member

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    This might be a dumb question -but why is it that TT and PUPs have their axles in the middle of the trailer, even very large ones with two sets of wheels? Semi trailers have their wheels more to the back.
     
  2. McFlyfi

    McFlyfi Active Member

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    The farther back the fulcrum, the higher the tongue weight. Trailers towed by light duty vehicles need to be "balanced" to keep the tongue weight reasonable - 10- 15 percent of the trailer weight.
     
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  3. Daisy on my toe

    Daisy on my toe Active Member

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    Thanks!
     
  4. davekkk

    davekkk Active Member

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    I wish the wheels were back further on my little pup, its so light and hard to get enough tongue weight which makes it sway a bit. I feel like the manufactures at least in the 80's focused so much on low tongue weight for small cars pulling them, they didn't really care how the camper handled.
     
  5. jbirdt2001@yahoo.com

    jbirdt2001@yahoo.com Active Member

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    One other thought about big trucks is the weight they carry, the square inch of tire contact on the road and the weight restrictions on highways within a wet vehicle length
     
  6. tombiasi

    tombiasi Well-Known Member

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    The position of the trailer axels also determines the way the trailer turns. When a tight back up turn is likely the wheels are better to be more forward allowing the back to pivot over the axel. On straight trips with little or no backing the wheels placed near the back give a more stable ride. The rearward wheel placement was call "West coast wheels" by the old-time drivers.
     
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  7. Haybale

    Haybale I'd rather be camping!!

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    My question is why many 2 and 3 axle TT have like 2 feet of clearance under them, they look so top heavy. While most pop ups have much less clearance and you can't see most of the axle....
     
  8. Fbird

    Fbird Active Member

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    A longer trailer is more likely to bottom out on inclines, so they need more ground clearance
     
  9. Haybale

    Haybale I'd rather be camping!!

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    That's why buses and motor homes have a higher rear bumper, and some even have a set of wheels exactly for that.
     

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