Build your own
Towing
Dolly
Complete Step-by-Step Plans
And
Materials/Cutting List
Gross Trailer Capacity:
Empty Trailer Weight:
Empty Trailer Nose Weight:
Copyright © 2005 Roseand
3,500lbs
1,050lbs
90lbs
Materials List
¼” x 3” x 3” Sq Tubing
3
/16” x 2” x 2” Sq Tubing
¼” x 3” x 3” Angle
¼” x 2” x 2” Angle
¼” Diamond Plate
1
/8” Flat Plate
3
/16” Flat Plate
¼” Flat Plate
3
/8” Flat Plate
3” Channel (5lbs/ft grade)
1 7/16” Round Bar (HRR)
½” Round Bar (HRR)
1 ¼” Schedule 40 Black Pipe
1 ½” Double Heavy Wall Pipe
16 linear feet
11 linear feet
6 linear feet
25 linear feet
8 square feet
7 square feet
10 square feet
25 square feet
5 square feet
17 linear feet
1 linear foot
3 linear feet
9 linear feet
1 linear foot
NOTE:
The amounts shown above are for the EXACT needs for the plans detailed and
do not include any natural wastage incurred during cutting. It is always wise to
order slightly more materials at the outset rather than having to re-order small
amounts later.
Other Items Required
SAE Grade 8 Bolts with Lock Washers, Flat Washers & Nuts
3
/8” x 1”
/8” x 1½”
½” x 1”
½” x 3½”
½” x 4½”
½” x 6”
3
4
8
4
4
7
2
½” x 4 ½” high x 1 ½” wide U-Bolt w/washers & Nuts
2” Ball 7,000lb min Coupler
Bolt-on Spindle
14” Rims & Tyres
9” x 19” x 32” Mudguards
3
/8” x 150” Safety Chain with 2 Hooks
Trailer Lighting Kit
Spring Latches with ½” Shanks & Lock
DISCLAIMER:
As we have no control over the builders abilities or materials, we DO NOT
WARRANT these plans for any type of suitability of use and offer them for
experimental use only. IT IS HIGHLY SUGGESTED THAT THE FINISHED
PROJECT IS CHECKED BY A PROFESSIONAL TRADESMAN BEFORE
PUT TO USE.
Copyright © 2005 Roseand
STEP 1
SPINDLE SELECTION
The picture below shows the kind of spindle that this design uses.
These could be found by scouring the breakers yards and are commonly found on the rear
of front-wheel-drive cars.
Many other types could be utilized and new items can be bought from trailer companies
such as TrailerTek (www.trailertek.com). 13” or 14” rims should be used and matched to
the hubs used.
Copyright © 2005 Roseand
STEP 2
SPINDLE MOUNTING COMPONENTS
Copyright © 2005 Roseand
STEP 3
AXLE & SPINDLE ASSEMBLY
Copyright © 2005 Roseand
Copyright © 2005 Roseand
Copyright © 2005 Roseand
STEP 4
TONGUE & COUPLER
Copyright © 2005 Roseand
Copyright © 2005 Roseand
Copyright © 2005 Roseand
STEP 5
TONGUE MOUNTING HARDWARE
Copyright © 2005 Roseand
STEP 6
RAMP POCKETS
Copyright © 2005 Roseand
Copyright © 2005 Roseand
STEP 7
RAMP POCKETS (cont.)
Copyright © 2005 Roseand
Copyright © 2005 Roseand
STEP 8
RAMPS
Copyright © 2005 Roseand
STEP 9
RAMP SPRING LATCH
Copyright © 2005 Roseand
STEP 10
MUDGUARDS, LIGHTS & NUMBER PLATE BRACKET
Copyright © 2005 Roseand
STEP 11
PAN PLATE
Copyright © 2005 Roseand
STEP 12
PAN FRAME
Copyright © 2005 Roseand
Copyright © 2005 Roseand
Copyright © 2005 Roseand
Copyright © 2005 Roseand
Copyright © 2005 Roseand
STEP 13
PIVOT ASSEMBLY
Copyright © 2005 Roseand
STEP 14
TONGUE, BRACES AND TYRES
Copyright © 2005 Roseand
STEP 15
CLEAN / PREP / PAINT
Before painting, the entire trailer should be cleaned and free from rust and grease. To
accomplish this, all surface areas should be wire brushed and/or sanded. If severe rust is
present, sandblasting should be considered. The welded areas should be chipped of all
slag or residue and wiped clean with paint solvent. One or two coats of primer paint
should be applied, and one or two coats of top grade enamel as the final application. Paint
according to the manufacturers recommendations and safety guidelines.
Alternative finishes to consider are galvanizing and powder coating which will give the
trailer a hard, durable finish.
STEP 16
WIRING
Follow the wiring diagram provided or follow instructions that come with your lighting
kit.
The suggested routing of the wires is through the 3” square tubing where possible
although external routing may be preferred. The routing of wires through or around the
mudguards must be done in conduit to protect it from the tyres.
STEP 17
WEB RACHET SLIDE BRACKET
Copyright © 2005 Roseand
STEP 18
PAN INSTALLATION
SUPPLY LIST
(2) ½” X 3½” NC, SAE GRADE 8 BOLTS WITH WASHERS AND NUTS.
GREASE
All contact points where pan assembly wear bars meet the wear plates on the ramp
pockets are to be cleaned and free of weld spatter etc.
Apply grease liberally at all contact points.
Clean and liberally grease the pivot pin assembly.
Place the pan assembly in alignment with the pivot assembly, and carefully install the pin
so that the bolt holes line up.
Install the ½” x 3 ½” SAE Grade 8 bolts, washers and nuts to secure pan assembly.
Torque bolts to approx. 80 ft/lbs and apply Loctite.
Copyright © 2005 Roseand
STEP 19
SAFETY CHAINS
Copyright © 2005 Roseand
STEP 20
ELECTRICAL WIRING
The choice of Lamp Clusters is entirely up to you and what you feel looks right, but both
Lamp Clusters should have Tail Light, Brake Light and Indicator.
Below are some examples of suitable Lamp Clusters:
It should also be remembered that the right side light cluster also has to illuminate the
number plate unless a separate lamp is used for that.
For connecting the trailer electrics to the towing vehicle, a standard 12n trailer plug is
used (shown here) and the following diagram MUST be adhered to.
12N Trailer Plug
1
6
2
7
5
3
4
Female
PIN
COLOUR
1
2
3
4
5
6
7
Yellow
Blue
White
Green
Brown
Red
Black
FUNCTION
Left Indicator
Fog Lamps (if fitted)
Ground (chassis)
Right Indicator
Right Side Tail Lamp
Brake Lamps
Left Side Tail Lamps
Male
Care must be taken when routing the wiring. It is suggested that wiring is taken through
the frame of the trailer itself, (as shown earlier) and flexible conduit used where it is
routed next to the wheels and tyres. If in any doubt, consult a qualified auto electrician
and ensure everything works correctly before using on the public road.
Copyright © 2005 Roseand