I want to put this beast of a desk up on casters and now is an opportune time to do it whist I am decorating. I am going to need four heavy duty casters with a M8 screwed stem. But as you can see I am spoilt for choice. http://www.rosscastors.co.uk/rosscontactus My question and a tricky one from my image is what sort of weight is this desk? It has a metal base with a 1400 x 800 x 30mm top. It did once have a drawer unit but that was a heavy beast in itself but that has been removed and also placed on casters and is used as a storage unit come cat bed. So anyone got a rough idea of the weight so I buy the correct supportive casters?