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The truck in pic 053 that appears to be a Chev 1 1/2 Ton 4x4 ( known as a Yankee Joe in Oz) may in fact be a modified GMC 6x6. The grill seems to be flat bar instead of rod, the engine side panel has the louvres full length instead of only half way along and the running board looks more squared off than Chev which is rolled over on the edge. Also the rear diff looks to be a split/Timken type, the front diff is hard to tell.
The Diamond T pictured may have been a tandem drive as well originally
In poor countries it was not unusual to find 6x6 trucks with a rear diff removed for use elsewhere. This had a number of advantages. It could greatly reduce registration costs, it reduced the number of tyres required, if front axle drive was not needed, the transfer case could be deleted and then, if it was interchageable, the contents of the front diff could be used as a replacement when the rear wore out. With this in mind the Dodge in pic 60 could well be a WC62. I heard once that 6x6 Dodges normally copped this treatment in Burma. Sorry, Myanmar or whatever the country is called now.
David