A wheelbarrow comprising: a chassis to which at least one wheel is mounted for rotation of said at least one wheel about a center line of said at least one wheel for allowing rolling of said at least one wheel over a ground surface while supporting said chassis spaced from said ground surface, the chassis having: • a tray support portion; • at least one handlebar, wherein, if the wheelbarrow is in a transport position, the at least one handlebar projects in a direction rearward and upward from said tray support portion; and • at least one support leg, wherein, if the wheelbarrow is in a rest position, said support leg is rearward of said at least one wheel and extends downwardly for resting on the ground supporting the wheelbarrow rearward of the at least one wheel and wherein, if the wheelbarrow is in said transport position, said support leg is rearward of said at least one wheel and spaced from the ground; and a tray for holding a load, said tray having: • a bottom; • an open top for loading material to be transported into the tray and dumping the transported material from the tray; wherein said tray is pivotable relative to said chassis about a pivot axis forwardly of said center line of said at least one wheel, from a load carrying position in which said bottom is closely adjacent to said tray support portion to a dumping position in which said bottom is pivoted away from said tray support portion for said dumping of the transported material and vice versa; and wherein said tray is provided with a guide for allowing guided displacement of said pivot axis along said tray between a first position and a second position, said pivot axis being in said first position if said tray is in said load carrying position, and relative to said tray, said second position of said pivot axis is rearward from said first position of said pivot axis; and wherein said tray has a forward end wall having a bottom end and a top end and extending outwardly inclined from said bottom end to said top end; characterized in that said guide for allowing guided displacement of said pivot axis extends substantially parallel to said forward end wall; and wherein, in relation to said tray in said load carrying position on a wheelbarrow in said rest position, said second position is also downward from said first position. a chassis to which at least one wheel is mounted for rotation of said at least one wheel about a center line of said at least one wheel for allowing rolling of said at least one wheel over a ground surface while supporting said chassis spaced from said ground surface, the chassis having: • a tray support portion; • at least one handlebar, wherein, if the wheelbarrow is in a transport position, the at least one handlebar projects in a direction rearward and upward from said tray support portion; and • at least one support leg, wherein, if the wheelbarrow is in a rest position, said support leg is rearward of said at least one wheel and extends downwardly for resting on the ground supporting the wheelbarrow rearward of the at least one wheel and wherein, if the wheelbarrow is in said transport position, said support leg is rearward of said at least one wheel and spaced from the ground; and a tray for holding a load, said tray having: • a bottom; • an open top for loading material to be transported into the tray and dumping the transported material from the tray; • a tray support portion; • at least one handlebar, wherein, if the wheelbarrow is in a transport position, the at least one handlebar projects in a direction rearward and upward from said tray support portion; and • at least one support leg, wherein, if the wheelbarrow is in a rest position, said support leg is rearward of said at least one wheel and extends downwardly for resting on the ground supporting the wheelbarrow rearward of the at least one wheel and wherein, if the wheelbarrow is in said transport position, said support leg is rearward of said at least one wheel and spaced from the ground; and a tray for holding a load, said tray having: • a bottom; • an open top for loading material to be transported into the tray and dumping the transported material from the tray; wherein said tray is pivotable relative to said chassis about a pivot axis forwardly of said center line of said at least one wheel, from a load carrying position in which said bottom is closely adjacent to said tray support portion to a dumping position in which said bottom is pivoted away from said tray support portion for said dumping of the transported material and vice versa; and wherein said tray is provided with a guide for allowing guided displacement of said pivot axis along said tray between a first position and a second position, said pivot axis being in said first position if said tray is in said load carrying position, and relative to said tray, said second position of said pivot axis is rearward from said first position of said pivot axis; and wherein said tray has a forward end wall having a bottom end and a top end and extending outwardly inclined from said bottom end to said top end; characterized in that said guide for allowing guided displacement of said pivot axis extends substantially parallel to said forward end wall; and wherein, in relation to said tray in said load carrying position on a wheelbarrow in said rest position, said second position is also downward from said first position.