A roller assembly including: a frame; a first undercarriage connected to the frame, the first undercarriage comprising: a first body; a rear roller connected to the first body; and a first overlapping roller that is elongate and connected to the first body; and a second undercarriage connected to the frame, the second undercarriage comprising: a second body; a front roller connected to the second body; and a second overlapping roller that is elongate and connected to the second body, wherein the first undercarriage is positioned adjacent to the second undercarriage such that the first overlapping roller overlaps the second overlapping roller.L'invention concerne un ensemble rouleau comprenant : un cadre ; un premier train de roulement relié au cadre, le premier train de roulement comprenant : un premier corps ; un rouleau arrière relié au premier corps ; et un premier rouleau de chevauchement allongé et relié au premier corps ; et un second train de roulement relié au cadre, le second train de roulement comprenant : un second corps ; un rouleau avant relié au second corps ; et un second rouleau de chevauchement allongé et relié au second corps, le premier train de roulement étant adjacent au second train de roulement de telle sorte que le premier rouleau de chevauchement chevauche le second rouleau de chevauchement.