Truck and trailer compatability

Hey guys

I am looking at a truck to buy but want to make sure that I have enough clearance between the truck and trailer and that I am well under 75ft combination truck and trailer length. the details are below. Your help is greatly appreciated.

Step Deck Trailer measurements
- From the kingpin to the support braces under the upperdeck is 60"
- 9ft upperdeck
-Overall length 52ft

Here is my truck's current setup

-truck and trailer total length = 69'6"

this is a single axle truck

-Kingpin to end of the truck's frame is 53" ( I need to double check)
-Kingpin to end of the mudflap bracket is 57-58" ( I just remeasured)
-From the truck's frame to the support braces for/under the upperdeck is 7"
-From the mudflap straight back to the support braces for / under the upperdeck is 28"



-The truck I am looking to buy is a freightliner Columbia tandem rear axle with a 247" wheel base.

The total length of the truck is 28'7"
Right now it has a stationary wheel but if I buy it I would need an airslide

-Right now from the Kingpin to end of the truck's frame is 72"

-From the kingpin to the outside edge of the mudflap bracket is 84"

the truck is in North Dakota so unfortunately I cant go hook up the dang thing and see if everything has enough clearance.




The questions are:

1. How far back do I need to move the 5th wheel in order to have enough clearance between the truck's frame and the support braces under the upperdeck?

2. How much clearance will this give me between the truck's frame and support braces?

3. How much clearance will this give between the truck's mudflaps and support braces under the upperdeck?

4. What will my overall truck and trailer length be?

thanks,
Andrew

 

Kingpin to front of trailer is 18"
Kingpin to support braces under the upperdeck= 60"

 

how long was your upperdeck?

 

I would have to move the 5th wheel back 19" to give me the same clearance between the truck and trailer that I have right now with my current truck.

Which will give me a diagonal distance from the truck's kingpin to the mudflap of 65"


With my current truck the diagonal distance from the truck's Kingpin to the Mudflap is
about 58" ( I remeasured it)

Right now with my truck their is a 28" of clearance between the mudflap and the support brace.

so with the 5th wheel moved back 19" the KingPin to Mud Flap is 65" so my new clearance from the mudflap to the support brace is 21"


Does that sound right?

When you truck is turned at 90 degrees do you lose some of that 21" of clearance or does it stay the same no matter if the truck is straight or at a 90 degree angle?

thanks,
Andrew