Down below is the first RFSV under-tub winch-up twin jerrycan carrier I photographed, at the Land Rover Expo at Castle Hill Sep. 2014.
It was under Boxy's RFSV and he did a demo on the winching down and up.
I have recently taken archive photos of a NOS carrier. One day the details here may help a restorer.
The carrier mounts where the GS and FFR have their spare tyre, i.e., under the rear of the bodywork.
In the pic of Boxy's RFSV you can see the wheel brace in the slot to turn the spare tyre winch.
The under-tub RFSV winch up carrier is designed to fit two (traditional design) steel jerrycans stowed on their sides. Each jerrycan is approx. 345mm X 165mm X 470mm. The carrier box is manufactured from 1.90mm thick zinc electroplated steel. The steel sheet is machine cut and folded (at the four corners and on the lip of the east-west sides of the carrier).
The east-west sides of the carrier have a folded tab to overlap the north-south sides at the corners, and they are spot welded there. In the center section of the carrier base is a rectangular second piece of sheet steel spot welded in place to make a double thickness area of the base (designed to reinforce around the hole where the winch chain operates, i.e., where the carrier assembly is subjected to highest stress).
The carrier has four steel grab handles (riveted on with the aid of flat washers). The handles are 152mm long. These rivets are 50mm from the carrier base. The grab handles are used for moving the carrier in and out of winching position under the vehicle.
The carrier orientation: mounted behind the rear axle, i.e., the longest sides (with the grab handles) are parallel with the east-west line of the axle.
The carrier assembly length: east-west "higher sides" are 800mm long.
The carrier assembly width: north-south "lower sides" are 494mm long.
The carrier assembly depth: east-west "higher sides" are 204mm high and the north-south "lower sides" are 152mm high.
The carrier assembly weight (unloaded): 15kg.
The carrier assembly weight (loaded): 57kg (i.e., 15kg carrier weight, plus two steel 20 litre jerrycans weighing 4.5kg each, plus 40 litres of diesel at 0.83kg per litre).
There are two chassis rail mounting brackets spot-welded onto both of the east-west sides of the carrier box (4 brackets in total). Each mounting bracket has segments of rubber buffer riveted where the north-south chassis rails locate in the mounting bracket. The rubber buffers (part HYG2543) and associated galvanised steel brace strips (part HYG2652) are fitted using rivets. These are the same parts used in the twin jerrycan trays mounted onto each end of the rear chassis crossmember.
The four individual green poly webbing cargo straps (22mm wide, 200kg capacity) are fixed onto the carrier base at the outside ends with ANCRA Australia 25mm footman loops (part 43977-10, 500kg capacity using heavy duty rivets and a sewn loop in the webbing) while the adjustable end of the webbing is fixed to the base using a flat hook with a keeper (ANCRA Australia Flat Hook part 40044-10, 750kg capacity). The straps are adjustable to suit the jerrycan cargo using ANCRA Australia cam buckles (part 40880-21, 400kg capacity). see
http://www.ancraaustralia.com
