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That is a cool concept in hand trucks.
WG trucks are required to have a four-wheel padded dolly, two-wheel padded dolly and a pallet jack, among other things. Many WG drivers, on their own, carry a tripod dolly, also known as an appliance cart. While it is seldom used, it is the kind of thing you don't want to be without when the need for it arises. We use ours mostly for moving tall computer servers in and out of office buildings.
Appliance dollies are shown here:
http://www.handtrucks.com/hand-trucks/4567+1579.cfm
The kick-out wheels are a must. With those, you can put a heavy server on the cart and push the cart along without having to also balance the cart on two wheels. If necessary, you can even let the cart and freight stand still by itself while you walk away from it to tie open a door or use an intercom or simply take a moment to catch your breath. The kick-out wheels help keep our freight steady and safe.
Our hand truck of choice is the Wesco Three-Position hand truck, shown here:
http://tinyurl.com/n3xvm
We make frequent use of the diagonal position if the hand truck is used. Like the tripod dolly, it enables you to move the freight around without having to balance it on two wheels. The flat four-wheel position allows you to do the same.
Which is best? Only the kind of freight you are handling at the moment can say. One day the Wesco diagnal may be just what the Dr. ordered. Another day, a flat four-wheel configuration may be best.
The Rock N Roller high-stacker feature is not found on the Wesco Three-Position product. Where we have a number of boxes for which the high-stacker would be ideal, we compensate by using large rubber bands to wrap around the boxes to keep them secure on the cart when it is on the flat four-wheel position.
These bands are the same bands used to secure furniture pads onto freight when pads are used. The Mover's Rubber Bands are shown here:
http://newhaven-usa.com/moving7.shtml#960
Shrink wrap can also be used to secure boxes on a flat four-wheel dolly or furniture pads to the freight they protect. The disadvantage of that is debris removal (the used shrink wrap) once you get the freight where it is going.
If storage space in the truck is a concern, the edge may go to the Rock N Roll dolly. It folds up smaller than the Cobra hand truck does.
Whatever kind of hand truck you buy, pneumatic wheels are essential. When it comes to bouncing over street curbs, over door jams, up or down steps, or across non-paved surfaces like grass or dirt in construction sites. pneumatic wheels are far superior than hard-rubber wheels.
