Installation Instructions for Part #50064-58
Chevrolet/GMC 1500/2500/3500 Custom Quick Install Mounting Kit with Base Rail Kit

Part Numbers:

• 50064: Custom Quick Install Bracket Kit
• 58058: Base Rail Kit

Tools Required:

• Wrenches: 3/4”, 7/8”, 15/16”, 1-1/8”
• Drill Bits: 1/8”, 9/16”, 11/16”, 3/4”
• Other Tools: Center Punch, Measuring Tape, Torque Wrench

Hardware List:

50064 Bracket Kit

• (4) Frame Brackets
• (4) 3/4” x 2” Hex Bolts
• (4) 3/4” Lock Washers
• (4) 3/4” Hex Nuts
• (6) 3/4” Flat Washers
• (10) 1/2”-13 x 2” Carriage Bolts
• (8) 1/4” x 1-1/2” x 2” Offset Spacer Blocks
• (8) U-Shaped Blocks
• (4) 1/2”-13 x 4.5” Carriage Bolts
• (2) 5/8”-11 x 1.75” Button Head Bolts
• (2) 5/8” Hex Nuts
• (2) Pull Wires (1/2”)

58058 Base Rail Kit

• (2) Base Rails
• (10) 1/2”-13 x 2” Carriage Bolts
• (10) 1/2”-13 Hex Nuts
• (10) 1/2” Conical Washers
• (10) U-Shaped Blocks

Step-by-Step Instructions:

Step 1: Prepare the Truck

• Lower and remove the spare tire for additional working space.
• Remove the passenger side exhaust heat shield for access.
• On trucks with factory trailer brake controllers (2007+):
  • Relocate the electrical plug on the inside of the driver’s side frame rail using the supplied angle bracket.

Step 2: Position the Rear Mounting Rail

• Place the rear base rail into the truck bed.
• Measure the correct distance from the rear edge of the truck bed to the rear edge of the rail:
  • Short Bed (5’8” or 6’6”): 26-1/4”
  • Long Bed (8’0”): 28-3/16”
• Ensure the rail is centered between the truck bed weld seams.

Step 3: Mark and Drill Rear Rail Holes

• Use a center punch to mark the bolt hole locations through the rail’s pre-drilled holes.
• Drill 1/8” pilot holes at the marked positions.
• Temporarily position the rear frame brackets to confirm alignment with the pilot holes.
• Enlarge the holes to 9/16” for the carriage bolts.
  • Paint any bare metal to prevent rust.

Step 4: Install Rear Frame Brackets

• Attach the rear frame brackets to the truck frame using:
  • 3/4” x 2” hex bolts, 3/4” flat washers, 3/4” lock washers, and 3/4” nuts.
• Use spacer blocks as needed to fill any gaps between the bracket and the truck frame.

Step 5: Secure the Rear Base Rail

• Reposition the rear rail over the drilled holes.
• Insert 1/2”-13 x 2” carriage bolts through the rail and truck bed.
  • Place U-shaped blocks into bed corrugations to prevent crushing.
• Under the truck bed, attach the carriage bolts using:
  • 1/2” conical washers and 1/2”-13 hex nuts.
• Hand tighten all hardware.

Step 6: Position the Front Mounting Rail

• Insert the 5th wheel hitch, slider, or gooseneck into the rear base rail.
• Position the front rail in the truck bed by aligning the hitch tabs with the front mounting rail slots.
• Ensure the rail is centered between the truck bed weld seams.

Step 7: Mark and Drill Front Rail Holes

• Mark the bolt hole locations for the front rail using the center punch.
• Drill 1/8” pilot holes and confirm alignment with the front frame brackets.
• Enlarge the holes to 9/16”.

Step 8: Install Front Frame Brackets

• Attach the front brackets to the truck frame using the same hardware sequence as in Step 4.

Step 9: Secure the Front Base Rail

• Reposition the front rail over the drilled holes.
• Insert 1/2”-13 x 2” carriage bolts through the rail and truck bed.
  • Use U-shaped blocks and spacer blocks to ensure metal-to-metal contact.
• Secure the bolts underneath with 1/2” conical washers and 1/2”-13 hex nuts.

Step 10: Final Torque of Hardware

• Starting with the base rails, torque all hardware to the following specifications:
  • 1/2” Carriage Bolts: 75 ft-lbs
  • 3/4” Hex Bolts: 260 ft-lbs
• Tighten all frame bracket hardware and ensure proper alignment.

Step 11: Reinstall Components

• Reattach the electrical plug using the angle bracket.
• Reinstall the exhaust heat shield and the spare tire.

Safety Notes:

• Do not install mounting rails over plastic bed liners. Cut the liner to allow for metal-to-metal contact.
• Spray-in liners are acceptable if properly cured.
• Always verify trailer-to-truck clearance at the cab and bumper before towing.

Specifications:

• Maximum Tongue Weight: 4,500 lbs (2,040 kg)
• Maximum Gross Trailer Weight: 18,000 lbs (8,160 kg)
• Compliance: SAE J-684

Warning: Double-check all bolts for proper torque before towing. Failure to do so may result in injury or damage.