Ryan,
The trailer you have is ARN 166058, made by FMC as serial JT985. The reason it has Land Rover lights fitted is because it was not declared for disposal until 28 November 1975 when the trailer type was declared obsolete. The disposal was from 331 Supply Company.
There is a good description of the 80 gallon water tank kit in the MGO Equipment Memorandum, Volume 16, page 69, of June 1945. It is for the No3 and 3A trailer but makes the interesting observation that the 'latest' trailer design (ie the No.4) includes the aperture in the rear panel for the outlet pipe, whereas the No3/3A required cutting to fit the kit. It appears your trailer is missing the pipe across the rear with the three taps, which should be easy to replicate.
Nice find indeed!
Mike
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