This post covers a building a one person removal rig for
a truck cap or topper, with an uneven bottom and asymmetrical shape. Such was the job in lifting the cap from a
2004 Nissan Titan pickup truck. This post discusses methods of getting
support boards under this type of cap and lifting and hanging from ceiling joists in a garage.
Parts and materials:
- A garage
- Two 2 by 4s, 79” long (will vary depending on application).
- Four small wood blocks cut from a two by four, four inches long.
- Two wood blocks, ½”thick and four inches by 3 ½ inches
- Eight lag screw eyelet hangers, 3/8” by 4 ½” (Lowe’s 21796 $.78ea for a total of $6.24)
- Four cam buckle straps, 900lb capacity and 10 feet long (name brand "Smart Straps," $9.98 total at the regional Midwest big box home improvement store Menard’s) See link below this post to the same straps on Amazon.
- Two ratcheting straps 600lb capacity and 16 feet long (name brand "Keeper," $6.99 ea for a total of $13.98). I posted a link to a four pack from Amazon at the end of this post.
- Optional helper fixture for one person to raise of the end of the cap:One two by four two inches longer than the distance from the truck bed to the underside of the rear end of the topper.
- An eight inch piece of two by four to act as a cross member
- Ten 2 ½” long wood screws such as deck screws
Tools:
- Electric or cordless drill
- 5/16” drill bit
- Tape measure
- Circular saw or hand saw
- Saw horses
- Plump bob
1) Back the truck, with topper aboard, into the desired
position where the cap will be removed. It needs to be centered beneath two
ceiling joists.
2) Remove the clamps holding the cap to the truck and
disconnect any wiring to the cap.
3) While raising the cap with your arm, or better yet a T-shaped
helper fixture, slip one of the long two by fours under both sides. The helper
brace will provide mechanical advantage for lifting the back of the cap. If
making a helper, measure the distance from the truck bed to the underside of
the topper back end and add two inches. Then simply screw in an eight inch
cross member to the top. While sitting on the tailgate and with the top (tee)
end near the end of the top of the cap and the lower end toward the front,
slide the helper brace into the vertical position thereby lifting the end of
the cap.
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| A simple "tee" shaped jig or brace will greatly ease lifting the end of the cap upward |
4) Center the two by four. There should be about three
inches of overhang on each side of the cap.
5) Lift each corner of the topper and slip in a 4 inch long
piece of two by four under the wide part of the base. Position it so there is
about an inch between the outside edge of the block and the overhanging ridge
on the topper. This will provide some wiggle room when moving the front board
forward.
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| A four inch long piece of 2 by 4 lumber was perfect to support the bottom of the cap |
6) Mark the position of each block on the long board with a
marker. Remove the board now and attach the blocks with a couple of 2 ½”
screws. Repeat the process on the other board and make it identical.
7) Place both boards under the end of the topper. This will
be easier if you have a helper piece still in place.
8) Remove the helper support if still in place. Slide the
inner board forward to its final position under the rafter. This may require
going back and forth from side to side and moving it a foot or two at a time. Check
the block to see if it is still supporting the broad part of the under base of
the cap. This one was not. If necessary add an additional board to the block to
make sure the outside edge of the topper isn’t supporting it. This would not be
good enough to support the weight of the topper. I had to add an extra ½” block
to the original one.
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| In the front we needed and extra half inch spacer to get the outside ridge up |
9) Check that the two support boards are evenly spaced from
the front and rear of the cap. This would be a good time to move the truck
forward or back to see that the boards are centered. A plumb bob is useful here
to make sure the boards are spaced properly and right under the ceiling joists.
10) With a plumb bob mark the rafter in eight spots. The inside spot will be where the
plumb bob just brushes on the cap. The outside mark is where the plumb bob is
brushing the outside edge of the support board. Drill a 5/16” hole in each of
the eight marked places.
11) Turn in the lag screw eyelet into each drilled hole.
12) One by one hang the cam buckle straps. Feed the free end
through the inner lag scew. Assemble the buckle so that when the end strap
pulls down it will lift and then lock in place. Place the loop of the strap
under the board and just touching the edge of the topper. Raise the cap 2 or
three inches. Repeat on the other three
corners.
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| Lift at the same time as pulling down on the cam buckle strap. Voila, the cap goes up! |
13) With the cap suspended evenly, hang a ratcheting strap
from opposite sides and center it on the support board as you ratchet it up.
Ratchet just until it is taught. All straps should be evenly tight. Repeat with
the other strap.
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| Center the ratchet strap (yellow) under the board |
14) Drive the truck out and check for level. Set the desired
height for the topper by pulling up a bit on each cam buckle strap in turn.
Finish by snugging up the ratcheting straps.
Cam buckle straps Ratcheting straps
