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Rear most storage boxes dimensions??


rpsinc
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Working on some modifications on my bed and need info about the clearance needed for a box I will place behind my tandem rear tires.  Some of you that have designed and built your beds, what is minimum distance from the ground to the bottom of a box for clearance to prevent hitting the box.  I plan on using a box I already own and making accomodation for my Smart ramps which will facilitate moving my hitch back about 20" for clearance to the Smart with our new to us NH.  

Any input from the voices of experience is appreciated.

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My truck is singled but, the issue is the same, approach angle.   How far behind the axle centerline is box?     My rear boxes extend 46" from the centerline of the axle and at ride height are 15" from the ground.     I have a rather steep driveway entry and, use a drive on grain scale with quick riseing ramps.    With my suspension dumped there is 12" clearance and plenty of room on these.    The longer the overhang the more height you will need.    I don't recall what angle I used but 12-14 degrees seems in the ball park.

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Jerr-Dan - Complete Steel Tool Box System (78" x 21" 20" Toolbox)Will be repurposing 1 of the 2 of these that I already have.  My doors open the other way and I will have those opening to the rear.  78" long will allow for 10" boxes on each side to house the lights.  The top tray will be modified for ramp storage, either in front of the box(which will be toward the cab) or on top of the box, which is built for chain storage on rollback tow trucks.

Henry-what did you use to extend the frame for the hitch support.  I am thinking some 3/8" roll formed Cs made long enough to bolt to existing frame or weld to end and splice plate.

 

 

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2 hours ago, rpsinc said:

Henry-what did you use to extend the frame for the hitch support.  I am thinking some 3/8" roll formed Cs made long enough to bolt to existing frame or weld to end and splice plate.

 

 

 

1/4 inch plate rolled with the same radius as the frame, attached at the end of the slope. V grove both sides, weld both sides, grind inside flush to slide the hitch mounting angles in. Frame is about 1/4 inch thick so it works. Used to order it in two two footers or one four footer and cut these to length depending on the bed design.

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Finished and painted

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4 hours ago, Darryl&Rita said:

We're about 6" or 8" off the ground, 50" behind the tires. We drag, we knew we would drag, we built for it. Hammer down, power through. I can get exact measurements in a month, if I remember.

No need but thanks.  I will do what works for my situation but now I have a much better idea of what my min/max is.

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