Rusty to me the chassis is too long for a gun tractor and it looks like it is either a 60S or 60L fitted with a winch. A lot of vehicles were fitted with an extended wide chassi piece rivited to the original chassis between the springs to strengthen the chassis for heavier workloads.
The bonnet may have been replaced with a spare from a guntractor originally.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"