This is FDNY Ladder Company 48, which is housed with Engine 94 and Battalion 3 in the Bronx. Normally FDNY uses Ferrara and Seagrave rear-mounts, but sadly, there were not any Ferrara nor Seagrave rear-mounts in GTA 5. So this texture will be based out of Finch Modifications' Pierce Enforcer ladder.

Link to the model: https://www.lcpdfr.com/downloads/gt...7-2015-pierce-enforcer-ladder-working-ladder/