An interesting page is this index page with "distinguishing features", listing, among other vehicles, the elusive
C291QH, described as a "stripped C0011QF chassis 4x4" with 101-1/4" wheelbase
The
C19QHF is listed too as "stripped C01QF chassis 4x4" with 134-1/4" wheelbase.
Interestingly, the C01QF-C29Q chassis is listed as both a 30-cwt and 3-ton 123-1/4" chassis with the only difference being 10.50-16 versus 10.50-20 tyres.
There are no references to any of the Indian Pattern bodies, sadly.