I would suggest the over hang on that top one tonner would be far too much to be legal. The other problem would be tyre loading and the wheel bearings would be on the limit. The chassis is also only designed to carry less than a tonne payload as well.
Its a cool idea, but anyone who has driven an over loaded truck would agree, that would be a pig to drive on the road.
Lazy axle also equals no traction at all on the slightest uneven surface, so going through a driveway and you are stranded as soon as the weight comes off the driving wheel.
Buy a truck, thats what they were designed to do.