Forum Discussion

ChuckNTruck's avatar
ChuckNTruck
Explorer
Nov 25, 2016

Swap from St tires to LT

I dont want to start another LT vs ST debate. I just wanted to show how i did the swap on my trailer.
I used lift block designed and machined for trailer axles with larger u-bolts to lift the axles 2 inches. Then i swapped the 14in wheels with 205/75R14 tires to 15in wheels with LT235/75R15 tires. These are the smallest LT tires i could find. I have put about 1000-1500 miles on it so far and i have not noticed any difference in how it pulls or rides. But i like the extra 800lb capacity thee tires provide and the higher speed rating. I also added a BAL tire carrier so i wouldn't damage the rear bumper.
My X-chocks still fit between the tires perfectly and i have zero clearance issues anywhere.



  • dodge_guy's avatar
    dodge_guy
    Explorer II
    Nov 26, 2016
    What is the LR of those LT's? I was looking for a set of LR "E"'s for my trailer but couldn't find a set in A LT.
  • hohenwald48's avatar
    hohenwald48
    Explorer
    Nov 26, 2016
    ChuckNTruck wrote:
    I used 2in blocks because these tires are 3 inches overall bigger than the stockers and i already had a few marks where the factory tires rubbed above them.
    Also i got the blocks and U-bolt from
    http://www.trailerblocks.com/
    A little pricey but great quality!


    Thanks. Those blocks are a little pricy considering they're just a chunk of bar stock. I guess you had to also raise the hitch head 2" to keep things level?
  • ChuckNTruck's avatar
    ChuckNTruck
    Explorer
    Nov 26, 2016
    hohenwald48 wrote:
    ChuckNTruck wrote:
    I used 2in blocks because these tires are 3 inches overall bigger than the stockers and i already had a few marks where the factory tires rubbed above them.
    Also i got the blocks and U-bolt from
    http://www.trailerblocks.com/
    A little pricey but great quality!


    Thanks. Those blocks are a little pricy considering they're just a chunk of bar stock. I guess you had to also raise the hitch head 2" to keep things level?

    I just had to adjust my hitch from about a 7in drop to about a 3in drop. The equalizer shank i have had all the adjustment i needed.
    Between the 2in block and bigger tires it lifted my trailer about 3-4 inches
    Camper is nice and level now
  • ChuckNTruck's avatar
    ChuckNTruck
    Explorer
    Nov 26, 2016
    dodge guy wrote:
    What is the LR of those LT's? I was looking for a set of LR "E"'s for my trailer but couldn't find a set in A LT.


    My firestone load range Cs are single 1984lbs or double 1819lbs
    The goodyear load range Ds are single 2094lbs or double 1929lbs
  • ChuckNTruck's avatar
    ChuckNTruck
    Explorer
    Nov 26, 2016
    amxpress wrote:
    Hope you had the new tires balanced!

    Yep, Lug centric balanced.
  • Passin_Thru's avatar
    Passin_Thru
    Explorer
    Nov 26, 2016
    I have an Arctic Fox 31W. I used Isuzu truck rims and put Michelin LT 15s on. Ride is smoother and height the same.
  • Huntindog's avatar
    Huntindog
    Explorer
    Nov 26, 2016
    ChuckNTruck wrote:
    I used 2in blocks because these tires are 3 inches overall bigger than the stockers and i already had a few marks where the factory tires rubbed above them.
    Also i got the blocks and U-bolt from
    http://www.trailerblocks.com/
    A little pricey but great quality!
    Wow they sure are pricey.

    I got steel blocks here:Custom lift blocks
    When I did it, they only offered steel blocks with a maximum 1" thickness. So I ordered double and welded them together.
    I see they now are offering aluminum blocks in many thicknesses...
    And the prices are a lot more reasonable.
  • Huntindog's avatar
    Huntindog
    Explorer
    Nov 26, 2016
    time2roll wrote:
    Blocks
    Those blocks won't work for trailer springs.
    They are 2.5" wide, trailer springs are usually 1.75" wide.
  • JIMNLIN's avatar
    JIMNLIN
    Explorer III
    Nov 26, 2016
    Moving to a LT is a great move for 40k-60k miles and 7-10 years of trouble free service on any trailer.

    However be warned suspension lift blocks on a trailer aren't the best idea for several reasons.
    Side loading as a trailers tire/wheel and suspension slips sideway as the trailer goes around a corner or backing makes going to the next diameter U bolts.....heavier top plate.....and especially heavier spring keepers is a wise choice. Blocks add more leverage to all those components.

    You may also want to check with your state dot folks if its legal to do so on a trailer. Haulers from certain states have reported suspension blocks they added on their trailers in commercial service not passing the required annual vehicle safety inspections.

    I would do a monthly suspension check...especially U bolts and spring keepers.

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