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Old 11-19-2016, 04:54 AM   #1
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Semi Based Trailer - Hitch placement question

I am looking at the Volvos like the 780 and the Semi based builds from Forks and Spacecraft.

If you are going to do a smart Car Hauler 780 with the Semi trailer Kingpin placement.

How far back do you have to move the hitch?
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Old 11-19-2016, 08:38 AM   #2
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You have a guy in your town that makes hitches. E/T hitch. He is a good source of information. Google for his phone number.
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Old 11-19-2016, 05:16 PM   #3
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You have a guy in your town that makes hitches. E/T hitch. He is a good source of information. Google for his phone number.
Hi,
I am going to meet up with him, he has extended an invitation to me.. But I cannot use one of his hitches and the measurements for his Hitches won't help me.

I will need to use a commercial hitch with a 3' setback on the Kingpin.

I thought there might be some Semi Trailer based folks who could weigh in.
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Old 11-19-2016, 08:49 PM   #4
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Post your questions over on the RVNetwork. The HDT crowd can help you out. Depending on pin weight, the ET might still work. You can mount it between the rails as low as you want. We met with Marsha this past week. Their build time waiting list is into NEXT November, so you might want to get a build slot allocated as quick as you can.
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Old 11-20-2016, 01:37 AM   #5
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Post your questions over on the RVNetwork. The HDT crowd can help you out. Depending on pin weight, the ET might still work. You can mount it between the rails as low as you want. We met with Marsha this past week. Their build time waiting list is into NEXT November, so you might want to get a build slot allocated as quick as you can.
Thanx for that. I just posted over there.

I'm doing my Homework and planning now so am 2 years or so out ahead.
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Old 11-20-2016, 10:29 AM   #6
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Les, when I was at the HDT Rally in Hutchinson, Kansas I measured the distance from back of cab/drom to king pin and most were about 10'6" (older Smart Cars) and the newer set ups (newer Smart Cars) the distance went to 11'. That is with a pin box on a fiver. For your set up you should be looking at about 12' distance due to the distance from the pin to the corner of the trailer. The 2016 Smart cars are 65 1/2 inches wide plus mirrors, and the older ones are 61 3/8" wide plus mirrors.
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Old 11-20-2016, 12:24 PM   #7
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Les, when I was at the HDT Rally in Hutchinson, Kansas I measured the distance from back of cab/drom to king pin and most were about 10'6" (older Smart Cars) and the newer set ups (newer Smart Cars) the distance went to 11'. That is with a pin box on a fiver. For your set up you should be looking at about 12' distance due to the distance from the pin to the corner of the trailer. The 2016 Smart cars are 65 1/2 inches wide plus mirrors, and the older ones are 61 3/8" wide plus mirrors.
Hi,

I think the pin on the Semi Trailer is 3' back. That would be 5' to the Diagonal corner roughly.
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Old 11-20-2016, 03:12 PM   #8
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Well, if you figure a Smart sideways then you are looking at 72" (6 feet) from the back of the cab/drom for the car, and then another 6 feet for the trailer with the 5 foot corner. That should give you about 1 foot of clearance. If you are looking at a mini Cooper then the car is 13'2" (approx) long and I would want another six feet to the pin making for a rather long truck.
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Old 11-20-2016, 08:47 PM   #9
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Well, if you figure a Smart sideways then you are looking at 72" (6 feet) from the back of the cab/drom for the car, and then another 6 feet for the trailer with the 5 foot corner. That should give you about 1 foot of clearance. If you are looking at a mini Cooper then the car is 13'2" (approx) long and I would want another six feet to the pin making for a rather long truck.
I'm trying to figure out all the inches of course.

The Mini will nose up 18" or so past the side fairings when loaded lengthwise

I get the mini at 151" or 12.6'
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Old 11-21-2016, 08:47 AM   #10
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The BBC (bumper to back of cab) for a 780 according to THIS PDF is 188.8". So 188.8" plus 151" is 339.8". Add another 72" for the back of car to pin then you are at 411.8". Add another 6" for clearance from the cab to the front of the car and you have 417.8" or 34 feet 10 inches from front bumper to center of pin. This is entirely doable, but will limit access to where you can park. Also, to stay under 65' you are going to be limited to a trailer that is about 30' from the pin to back of trailer.
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Old 11-21-2016, 01:19 PM   #11
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The BBC (bumper to back of cab) for a 780 according to THIS PDF is 188.8". So 188.8" plus 151" is 339.8". Add another 72" for the back of car to pin then you are at 411.8". Add another 6" for clearance from the cab to the front of the car and you have 417.8" or 34 feet 10 inches from front bumper to center of pin. This is entirely doable, but will limit access to where you can park. Also, to stay under 65' you are going to be limited to a trailer that is about 30' from the pin to back of trailer.
Is BBC to the Back of cab or back of fairing do you think?

Those are the numbers throwing me off each time.

I keep rejiggering them hoping they'll get shorter!
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Old 11-21-2016, 05:50 PM   #12
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BBC is Bumper to Back of Cab. Keep working on the numbers and you will get them where you want them!!
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