I think the difference in vent tube length was due to the location of the condenser. On the Truck anything venting could go over the driver, hence the long tube to divert it downwards, but the Jeep's condenser location at the front was too far away from the crew to cause any problems, and the short tube would allow the driver to see any venting steam over the bonnet/hood to warn him of any over heating. Seems reasonable but will now be proved wrong!
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