I've never saw a mid-mount ladder in diecast [ 1/43 - 1/50 - or 1/64 ]and not a toy or a platform but a ladder. Code 3 would be the first one to make it !
I have some pictures because I like this kind of apparatus.
The first one is a fire ladder from City of Gatineau in Quebec Canada. This ladder was manufactured by Thibault fire trucks on a Mack frame. Thibault is now the Pierce dealer for the east of Canada.
The second is an apparatus from City of Toronto. This ladder was manufactured by Smeal fire trucks, an U.S. dealer. I hope that I'm not the only one to like this kind of apparatus !