Lister 5/1 Diesel

Drawbar Trailer Design & Build

Designing & Building Our 6-Wheel Drawbar Trailer Page 15

LPG for the trailer was one of the jobs needing attention. We had planned on having a vapour LPG tank in the trailer so we could fill up at the same time as the car. To do this we bought a vertical 36litre gross tank from Tinley Tech, this came with an 80% cutoff valve, safety valve, gauge and outlet tap, plus there was a non-return valve in the filler union. Because the cylinder is only fillable to 80% of the gross capacity, we finished up with 29 litres usable capacity, which was fine for about 8 days of camping with hot water and showers etc.

LPG cylinder, vertical vapour outlet type.

Close-up of the top of the LPG cylinder.

The cylinder had to go inside at the back of the trailer, where it would be separated from the living quarters by the central bulkhead and from the kitchen area by that same bulkhead. We made up a pair of LPG filler points and had one each side so we could fill from inaccessible pumps. In practice, the fillers were so far behind the back of the car, we had to pull the whole outfit forward to get them near to the pump. In our local Shell garage, we could just do it without blocking the forecourt exit. In Holland, many of the motorway service areas had multiple pumps that we could access with no problem.

LPG Filler point on the side of the trailer. We used a stainless plate to spread the load a bit.

LPG Filler point inside the trailer. Regulator above, copper pipe goes to second filler on the other side.

Kitchen area vent panels in the bulkhead. Both are standard Electrolux parts..

Our initial tests with the fridge on electric did not turn up anything out of the ordinary, but when on gas it had twice the input power and the condenser ran very hot for 24 hours until the fridge had cooled down. To try and assist with the convection cooling, we fitted a small computer fan into the removeable access panel and wired that up to the 12V supply through a dropping resistor. This reduced the speed and noise of the fan, but still allowed the fan to shift a decent volume of air. It is just audible at night, but not enough to be disturbing anyone's sleep.

Fan and dropper resistor. The fan whines at full speed, probably as it is used to 12V not 13.5V.

Kitchen area vent fan cover.

Piping up the LPG took a little longer than we expected, as we had difficulty getting high-pressure flexibles of the correct rating for the filling side. In the end we used braided hoses, but we are looking at alternatives for when we add the third centre front filler point. That will be around the start of 2013. The high pressure rating is needed as the surge pressure at the start of filling is substantially higher than the pressure during the fill procedure.

General view of the tank, piping and regulator.

Closer view of the tank and piping.

Another view of the tank etc.

Next job was to fix the cylinder into the body of the trailer, it could not be left loose, especially with the pipes connecting to it. We couldn't fix it directly to the side of the trailer as we didn't want heat from sunlight to leak through and warm the cylinder up, not in summer time at least! To provide fixing points, we took the offcuts from the bed fixings and put M8 coachbolts into the back of them so that the threads stuck out. Then we drilled holes for four woodscrews that could go into the side panel of the trailer. Two pieces of wood with rounded corners were fabricated from some wood mouldings and screwed to the wall for the cylinder to sit against, then two stainless steel straps were made to

Lashing hard points for the LPG cylinder.

Lashing point close-up.

Buffer blocks for the LPG tank.

Main LPG tank retaining straps.

A piece of rubber sheet is going to be fitted underneath the tank, but it has proven to be quite solid and immobile in four trips since installation. We are also going to varnish the wood blocks, they look a bit bare and unfinished as they are. A third filler is planned for the centre/front of the trailer body. This it for easier filling when we don't have the room to move the trailer up to the pump for the existing filler points.

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