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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > tire changing jack

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mobeewan

Hampton, Va

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Posted: 08/09/20 11:46am Link  |  Quote  |  Print  |  Notify Moderator

goducks10 wrote:

6 ton bottle jack. I won't use those trailer aids as they put all the weight of one side on one axle. A bottle jack only lifts the flat tire an inch or so and the other tire stays on the ground so that side of the trailer is supported by both axles.
I have 5200 lb axles. TT has 7850 lbs on the axles. 1/2 of 7850 is 3925.
1/2 of 5200 is 2600 lbs.
I'd be supporting 3925 lbs with 2600 lbs of axle using a trailer aid.


Another problem besides the axle is that all the weight on one side of the trailer would be supported by a single tire. You now doubled the weight on that tire. Another issue is if you have body damage from a blowout and turning the tire will cause more damage. I carry a 9 ton bottle Jack. It can be used for more than changing tires.

JRscooby

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Posted: 08/09/20 12:18pm Link  |  Quote  |  Print  |  Notify Moderator

IMHO, you should always pull the flat tire on a block so you start with center of axle at least as high as with a inflated tire. Jack up from there, until you can slide the block out. Less distance to lift whole load, and you are sure the replacement will go on without "Up just a little more" That little more, with no wheel in place is when most likely to get hurt.

GrandpaKip

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Posted: 08/10/20 08:09am Link  |  Quote  |  Print  |  Notify Moderator

Trailer-Aid here, also.
Used it many times at home, fortunately not on the road.


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donut dave

Burnett WI

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Posted: 08/12/20 09:55am Link  |  Quote  |  Print  |  Notify Moderator

just used my trailer aid in june. had to put board under it to get enough clearance. otherwise my truck's bottle jack is the back up.

CavemanCharlie

Storden,MN

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Posted: 08/12/20 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

The Trailer Aid idea looks OK. But, 46 bucks is a lot.

Seon

Lake Camanche, CA

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Posted: 08/13/20 08:45pm Link  |  Quote  |  Print  |  Notify Moderator

pfidahospud wrote:

I've successfully tested and used my tow vehicle jack for my trailer. I'm not sure why it wouldn't work for others.


I don't know what make and model your tow vehicle is but my Yukon XL's scissors jack is the pits when I had to change tires on my trailer.

I bought a small 3 Ton Aluminum Floor Jack from Harbor Freight that's light and easy to stow.

JRscooby

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Posted: 08/14/20 04:28am Link  |  Quote  |  Print  |  Notify Moderator

Seon wrote:



I don't know what make and model your tow vehicle is but my Yukon XL's scissors jack is the pits when I had to change tires on my trailer.

I bought a small 3 Ton Aluminum Floor Jack from Harbor Freight that's light and easy to stow.


Your luck might be better than mine. If I'm out on the road I'm very likely to be missing a very important part needed for your new jack to work; A floor. That kind of jack, the lift plate goes up in a arc. This is not a issue, if, and only if the jack can roll. If of anything but a smooth hard surface, the lift plate is likely to slide, and drop the load. Even on a "brush finished" concrete driveway, you need to watch close as it goes up.

GrandpaKip

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Posted: 08/14/20 06:46am Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

Seon wrote:



I don't know what make and model your tow vehicle is but my Yukon XL's scissors jack is the pits when I had to change tires on my trailer.

I bought a small 3 Ton Aluminum Floor Jack from Harbor Freight that's light and easy to stow.


Your luck might be better than mine. If I'm out on the road I'm very likely to be missing a very important part needed for your new jack to work; A floor. That kind of jack, the lift plate goes up in a arc. This is not a issue, if, and only if the jack can roll. If of anything but a smooth hard surface, the lift plate is likely to slide, and drop the load. Even on a "brush finished" concrete driveway, you need to watch close as it goes up.

Very true. I use a piece of 3/4 plywood with a floor jack at home on the gravel driveway.

schlep1967

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Posted: 08/14/20 07:18am Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

Why do you assume I lift the flat tire more than an inch with my ramp? The tire on the ramp bears weight! Way off on this one, goducks.

Think this through a little. It doesn't matter if you are lifting 1 inch or 6 inches with the drive on type of jack. All of the weight is on one axle.
When you put a traditional type of jack under the flats axle you still have weight on the good tire's axle and weight on the jack under the bad tire's axle.

Example: 12,000 lb trailer, 2,400 on the hitch, 9,600 on two axles or 4,800 on each axle. 2 sides to each axle so 2,400 sitting on each tire.
Run one tire up onto a ramp it is holding the full weight of one side of the trailer or 4,800 lbs. Overloading that one tire.

Put a jack under the bad wheel's axle and lift and it is holding the 2,400 lbs for that axle while the good tire is still holding it's 2,400 lbs.

Which is really a moot point because when one tire is flat and or shredded, the other tire on that side is already overloaded and holding all the weight.


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JRscooby

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Posted: 08/14/20 08:03am Link  |  Quote  |  Print  |  Notify Moderator

schlep1967 wrote:

Lwiddis wrote:

Why do you assume I lift the flat tire more than an inch with my ramp? The tire on the ramp bears weight! Way off on this one, goducks.

Think this through a little. It doesn't matter if you are lifting 1 inch or 6 inches with the drive on type of jack. All of the weight is on one axle.
When you put a traditional type of jack under the flats axle you still have weight on the good tire's axle and weight on the jack under the bad tire's axle.

Example: 12,000 lb trailer, 2,400 on the hitch, 9,600 on two axles or 4,800 on each axle. 2 sides to each axle so 2,400 sitting on each tire.
Run one tire up onto a ramp it is holding the full weight of one side of the trailer or 4,800 lbs. Overloading that one tire.

Put a jack under the bad wheel's axle and lift and it is holding the 2,400 lbs for that axle while the good tire is still holding it's 2,400 lbs.

Which is really a moot point because when one tire is flat and or shredded, the other tire on that side is already overloaded and holding all the weight.


Going across a bridge jump will put more stress on all tires than you get when you lift 1 side with ramp under 1 wheel.
I use a ramp under the flat to lift most of the distance. It takes some force to work the jack when lifting. Just jack up to get the ramp out.

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