Shame the pics are a bit on the faded side Ron, thats a pretty good cross section of vehicles to have on a run though.
Wise move to have the snorkel up on the Champ, in the down position it sucks up the bow wave on anything above shallow. Which means an engine and fuel tank full of water. Talk about learning the hard way.....
You have probably seen this clip, Stalwart vs Humber, makes it clear why only one of them was regarded as High Mobility.
https://www.youtube.com/watch?v=tk5m4T7gM1I
Rich.