Hauler Racks STC3-1 User Manual

PRORAC CONTRACTOR SERIES

(2)

UNIVERSIAL STEEL TRUCK / CAP RACK

INSTALLATION INSTRUCTIONS

1000 Lb. Capacity Bed Mount
750 Lb. Capacity Cap Mount

Package Contents:
Parts Hardware

(4) Legs (12) 3/8”-16 x 1-1/4” Hex Head Bolts (86) Flat Washers
(4) Camper Plates (28) 3/8”-16 x 2-3/4” Hex Head Bolts (13) 3/8” Split Lock Washers
(2) Outer Crossbars (4) 3/8”-16 x 4-1/2” Hex Head Bolts (36) 3/8”-16 Nylon Insert Locknuts
(2) Inner Crossbars (4) 3/8”-16 x 5” Hex Head Bolts (12) 3/8”-16 Nuts
(2) Front Crossbar Adaptors (1) 3/8”-16 Wing Nut
(1) Middle Front Crossbar (1) Tube of Silicone
(2) Front Rails (8) 2” Square End caps
(2) Rear Rails (4) 1-3/4” Square End caps

Rear Rail Adaptors

Before you begin:

Do not carry more than 1000 pounds (454Kg) for leg mount or 750 pounds (340Kg) for cap mount of combined cargo and accessories on
ProRac crossbars. Distribute loads evenly across both crossbar. ProRac cannot warranty loads that exceed this limit.

Remove all components from the shipping carton and read the instructions thoroughly to familiarize yourself with the assembly sequence.
Gather the following tools used to assemble and install the rack.

9/16” Socket and open end wrench
3/8” dia drill bit and drill
Marker
Tape measure
Tape

HAULER RACKS, INC.

st

7109 31
Minneapolis, MN 55427-2848
WWW.HAULERRACKS.COM

Avenue North

1 of 16

Toll Free: 1-800-843-5445

Phone: [phone]

Fax: [phone]

Step 1 – Locate legs on truck bed

Locate on the truck bed where the front and rear legs will be positioned. The ideal positions for the legs are as far
forward for the front legs and as far rearward for the back leg.

You will need to have open access underneath the top of the bed surface for mounting the legs to the bed.
Check for obstructions in mounting the legs to the truck bed such as stake pocket holes or limited access to the

underside of the top surface of the bed.
Check for function of tailgate or interference with the cab of the truck. Adjust as needed.
The spacing between the centers of the bolt holes is 4-1/2”.
Place tape over the desired positions.
Place a leg on top of the tape and position the leg to the desired location on the top surface. For best results, use a

tape measure so each legs is positioned equally with the other side.

Using a marker, mark the outline of the leg and the center of the two mounting holes onto the tape.
Repeat for all legs

HAULER RACKS, INC.

st

7109 31
Minneapolis, MN 55427-2848
WWW.HAULERRACKS.COM

Avenue North

2 of 16

Toll Free: 1-800-843-5445

Phone: [phone]

Fax: [phone]

Step 2 Measure distances

Truck Bed Mount

Measure from driver side to passenger side on the inside marked edges of the tape where the legs where outline
from step 1. See illustration below.

Cap Plate Mount
Measure from driver side to passenger side inside edges of the bed rail. See illustration below.

Front truck leg or cap mount span = _____________________

Rear truck leg or cap mount span = _____________________
Measure the distance between the marked inside edges of the legs front to back and record the value belo w.
Inside span between front and rear legs = _____________

From the measurements above
Front cap bed mount span +12” = ___________
Rear cap bed mount span +12” = ___________

HAULER RACKS, INC.

st

7109 31
Minneapolis, MN 55427-2848
WWW.HAULERRACKS.COM

Avenue North

3 of 16

Toll Free: 1-800-843-5445

Phone: [phone]

Fax: [phone]

Step 3 Crossbar assembly
Crossbar width fit

Because truck beds widths can taper front to back, each crossbar will be set specifically to match where it is mounted
on the bed. The crossbar width will be 5-1/4” shorter than the length measured.

Using the measurements from step 2,

Front Legs span ___________________ - 5-1/4” = _________________

Rear Legs span ____________________ - 5-1/4” = _____ ____________
Slide the 1-3/4” inner crossbar tube into the 2” out crossbar tube as shown until they measure the length from above.
Temporarily secure the two crossbars together by wrapping tape around the end of the 2” outer crossbar and 1-3/4”

inner crossbar.

Using the 2” tube bolt holes as guides; mark the center of the holes using a center punch.
Drill the holes marked with a 3/8” drill bit on both sides. Remove tape that was temporarily holding the two crossbars

together.
Align the bolt holes of both tubes. Apply a small bead of silicone around the bolt holes on the larger tube.
Insert the 3/8”-16 x 2-3/4” bolt with a flat washer through the crossbar.
Secure the bolt with a flat washer and 3/8”-16 nylon insert lock nut.
Repeat for other bolt hole.
Place the end caps on the ends of the crossbar.
Apply silicone to the gap between the inner and outer crossbar to seal out water and reduce wind noise.
Repeat step for other crossbar.

HAULER RACKS, INC.

st

7109 31
Minneapolis, MN 55427-2848
WWW.HAULERRACKS.COM

Avenue North

4 of 16

Toll Free: 1-800-843-5445

Phone: [phone]

Fax: [phone]

Step 4 Crossbar to leg assembly

Note: Rail pass through tube on leg is not shown for exploded view clarity.
You may mount to either the front side or rear side of the legs.
Orientate the 1-3/4” tube as shown (note the holes are not centered on this end of the crossbar)
Starting with the bottom hole first, insert the 3/8”-16 x 4-1/2” bolt with a flat washer through the leg and 1-3/4” square

crossbar.
Secure the bolt with a flat washer and 3/8”-16 nylon insert lock nut.
Note the spacing between the washer fit is tight, it maybe necessary to adjust the washer centering so they will both

fit flush on the legs and crossbars.
Repeat for other bolt hole.
Lightly tighten the hardware.
Insert the 2” square end cap into the top of the leg.

HAULER RACKS, INC.

st

7109 31
Minneapolis, MN 55427-2848
WWW.HAULERRACKS.COM

Avenue North

5 of 16

Toll Free: 1-800-843-5445

Phone: [phone]

Fax: [phone]