The early Caterpillers were rated by weight like the "2 Ton Cat". The next ones were the 15 Cat, 20 Cat, etc but they were a bit heavier than the numbers might imply. When they came up with the "D" series they were way heavier.
The USAF tried dropping a D7 out of a Hercules in Vancouver in the 1960s and as the chutes opened they ripped off one by one but the Cat did make it to the ground, albiet in not too good of shape. They've perfected the technique since then!
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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