A releasable wheel assembly (1000, 1100, 1200) comprising: a base plate (1002, 1102, 1202) comprising a pair of side walls (618, 706, 914, 1008, 1106, 1206), wherein each side wall of the pair of side walls (618, 706, 914, 1008, 1106, 1206) is defined on one side of the base plate (1002, 1102, 1202); a bracket (1120, 1212) coupled to the base plate, the bracket comprising a plurality of bosses, each boss comprising a hole; an axle passing through the hole of each boss, the axle including a pair of circumferential grooves, wherein each circumferential groove is adjacent to a respective end of the axle; a pair of wheels on the axle, the axle extending through a hub on each wheel; a pair of locking caps, each locking cap fitting over an end of the axle, and each locking cap comprising a clip for engaging the axle at the circumferential groove; and characterised by, a pair of braces (608, 704, 806, 902, 1004, 1104, 1204), wherein the pair of braces are symmetrical, wherein each brace (608, 704, 806, 1004) of the pair of braces (608, 704, 806, 902,1004, 1104, 1204) comprises: a first end (622, 712, 816, 1012) coupled to a respective side wall of the pair of side walls (618, 706, 914, 1008, 1106, 1206) of the base plate; a second end (624, 716, 814, 1014) coupled to the axle between one wheel of the pair of wheels and one locking cap of the pair of locking caps; and a middle portion (634, 720, 818, 1010, 1210) defined at an angle between the second end (624, 716, 814, 1014) and the first end (622, 712, 816, 1012), the middle portion (634, 720, 818, 1010, 1210) extending outward from the base plate, and at an upward angle from the first end (622, 712, 816, 1012) to the second end (624, 716, 814, 1014). a base plate (1002, 1102, 1202) comprising a pair of side walls (618, 706, 914, 1008, 1106, 1206), wherein each side wall of the pair of side walls (618, 706, 914, 1008, 1106, 1206) is defined on one side of the base plate (1002, 1102, 1202); a bracket (1120, 1212) coupled to the base plate, the bracket comprising a plurality of bosses, each boss comprising a hole; an axle passing through the hole of each boss, the axle including a pair of circumferential grooves, wherein each circumferential groove is adjacent to a respective end of the axle; a pair of wheels on the axle, the axle extending through a hub on each wheel; a pair of locking caps, each locking cap fitting over an end of the axle, and each locking cap comprising a clip for engaging the axle at the circumferential groove; and characterised by, a pair of braces (608, 704, 806, 902, 1004, 1104, 1204), wherein the pair of braces are symmetrical, wherein each brace (608, 704, 806, 1004) of the pair of braces (608, 704, 806, 902,1004, 1104, 1204) comprises: a first end (622, 712, 816, 1012) coupled to a respective side wall of the pair of side walls (618, 706, 914, 1008, 1106, 1206) of the base plate; a second end (624, 716, 814, 1014) coupled to the axle between one wheel of the pair of wheels and one locking cap of the pair of locking caps; and a middle portion (634, 720, 818, 1010, 1210) defined at an angle between the second end (624, 716, 814, 1014) and the first end (622, 712, 816, 1012), the middle portion (634, 720, 818, 1010, 1210) extending outward from the base plate, and at an upward angle from the first end (622, 712, 816, 1012) to the second end (624, 716, 814, 1014). a first end (622, 712, 816, 1012) coupled to a respective side wall of the pair of side walls (618, 706, 914, 1008, 1106, 1206) of the base plate; a second end (624, 716, 814, 1014) coupled to the axle between one wheel of the pair of wheels and one locking cap of the pair of locking caps; and a middle portion (634, 720, 818, 1010, 1210) defined at an angle between the second end (624, 716, 814, 1014) and the first end (622, 712, 816, 1012), the middle portion (634, 720, 818, 1010, 1210) extending outward from the base plate, and at an upward angle from the first end (622, 712, 816, 1012) to the second end (624, 716, 814, 1014).