Hi Evertrainz,
There was just one batch of LMS-style (wooden body) Lowfits with LMS 8-shoe brakes, under diagram 1/001. All the other (steel) Lowfits were diagram 1/002, although there were slight differences to bodywork (number of strengthening struts on the sides) and different type of brakegear (LNER 8-shoe, BR 4-shoe, BR 8-shoe) for the various batches (details below). All had the same planked wooden floor, so I'm not sure what you mean by raised floor.
As you say, typical loads were tractors, agricultural machinery and small military vehicles. It would be interesting to see pictures of them carrying containers, because they certainly weren't meant to, as they lacked the chains and shackles of a proper Conflat to secure the container.
2107 B 450000-450399 Lowfit (wooden) 1/001 Wolverton Works 1950
2194 B 450400-451399 Lowfit 1/002 Shildon Works 1951
2340 B 451700-451899 Lowfit 1/002 Shildon Works 1952
2420 B 451900-452199 Lowfit 1/002 Shildon Works 1953
2461 B 452200-452399 Lowfit 1/002 Shildon Works 1957
2467 B 452400-452599 Lowfit 1/002 Shildon Works 1955
2729 B 452600-452899 Lowfit 1/002 Shildon Works 1957
2998 B 452900-453449 Lowfit 1/002 Shildon Works 1959
Thanks,
Bill
ps was the wagon with the rugged body maybe a Pig iron carrier?
(edit to reformat Table and add ps)