Abstract: The wheeled structure includes two connected sub-assemblies articulated relative to each other, with conversion capability between three wheels in a single plane for ground running operations, two main wheels for conveyance like a hand truck, or two secondary wheels for transverse positioning when fitting panels vertically. The first sub-assembly accommodates main wheels and secondary wheels and the second sub-assembly accommodates a pole, telescopic column assembly and support frame for the plates. The two sub-assemblies are rigidly connected by an assembly unit having an arm ending in a caster. The sub-assemblies, depending on their relative angular position, fulfill various vertical and horizontal panel fitting functions. The pole is mobile vertically relative to the main wheels, to the rear thereof when running on the ground, and to the fore thereof when fitting the panels vertically by lifting action on the first sub-assembly.