The 20to trucks have standard dimensions (LxlxH): 13,6mx2,4mx2,79m;
The 7,5to trucks, usual can load max 2800kg and have standard dimensions (LxlxH): 6,2x2,4x2,45m.
The difference between tilt truck and van/box consist in loading mode, first of them can be loaded on both lateral sides and on back side, and the last of them back side only.