Mine had holes around the roof opening that resembled a 19 set antenna aerial base. There was nothing on the floor though.
Despite the frozen temps here in Canada, and especially here on the prairies (Shilo was used by both Canada and the USA for Arctic testing of equipment over the years) heaters seemed to be far and few between on military eqiupment until the late 60s. As a yong militiaman, all our M-135 2-1/2 tons had for winter use were frost shields for the windshields and side windows. But there was nothing to provide heat unless you count the little trap door on the floor for the master cylinder. This changed marginally in the mid 80s when the M35Cdn had a heater as standard equpment. It would at least keep the windows partilly defrosted, and given enough time, could possibly melt an icecube.
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