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Old 10-24-2012, 04:54 PM   #21
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There's something similar that allows motorhomes to tow gooseneck horse trailers.
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Old 10-25-2012, 06:56 AM   #22
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Are these folks using load distributing hitches who are having all these structural problems? Just about every day I see lawn and construction trailers being pulled by an old van and the thing is dragging the ground because there is no load distribution. Your device would help them out. However, a load distributing hitch evens out the load on all 4 wheels which is going to improve traction and braking.


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Old 10-25-2012, 08:54 AM   #23
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Here is a glimpse of was called in 1952 as a 'dolly'. It was a pair of wheels on an axle with leaf springs. The trailer hitched to a ball on top of the springs and the unit hitched to the car hitch. This is the same principle as tanden trailer combo on big rigs. Vertually impossible to back up your trailer. Dad was forced to buy this setup in Abilene in 1952 while towing a 26' travel trailer with a '48 Nash on our move from Michigan to California then. I was 14 in this photo and my 'job' was to connect and un hitch our rig. Another version was called a slimp wheel, a wheel under the hitch that swiveled. It was too pricey for my parents then.

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Old 10-26-2012, 03:36 PM   #24
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There used to be a company making 5th-wheel hitches called "Hitch-Buddy". Those would allow you to tow a fiver with a standard, "unmodified" (no hitch in the bed) pickup truck.

Here's a photo...



These same guys were advertising a dolly like the one in "The Long, Long Trailer". They're gone, now...
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Old 10-26-2012, 07:57 PM   #25
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C Train

This concept is used commercially where required by law and is known as a "C Train Dolly".


"The 'C-Train' is similar to an A-Train except that two drawbars are used to eliminate the freedom to rotate about a vertical axis at the hitch point. The dolly is equipped with a self centering, self steering axle that requires a side force of about 0.3g to steer. Canadian regulations allow slightly higher loads on C-Trains than A-Trains."
mty40.htm, DOUBLES: A-Train, B-Train, C-Train; Tractor towing two Trailers

Some of these dollys have a steering axle and some are solid. (depends on the length of the drawbars, the application, and the jurisdiction rules.)

The "C Train" was an attempt to eliminate one vertical pivot point on a multi trailer application thus making it somewhat more stable. Many "A Trains" were converted to "C Trains" to take advantage of the more generous GCVW's allowed.

There should be no reason that this concept would not work on a RV application, IF THE TOW UNIT HAD SUFFICIENT FRAME ABILITY TO HANDLE THE STRESS.

I doubt any pickup or 3/4 ton equipped from the factory would qualify. The distance between the drive axle and the hitch dolly would be an excessive ratio verses the weight of the towing vehicle.

Dave
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Old 10-26-2012, 09:24 PM   #26
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Look at a "Trailer Toad" it's close to your photo
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Old 10-27-2012, 12:43 AM   #27
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Quote:
Originally Posted by perryg114
The hitch does not fix the too much mass for the tow vehicle problem. You could tow a trailer with a Mini Cooper but why would you want to unless you live in Canada. I guess if you had an old 70's caddy with bad springs it might be helpful.

Perry
Not sure what the jab re Canada means in this post? Care to explain?
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