you people are so creative. 
good luck, gail
start w/ a base board of plywood or thick foamcore that will be able to span length of cake with out bending.
then two sections of 2 layers of cake.
front section, just boring old standard 2-layer cake tier carved a bit to get the rounded front end.
back section has the two layers off-set so the top hangs out over the back -- the trick here:
1) a second cakeboard under the top layer
2) a set of dowels that are OUTSIDE the cake that go from baseboard up to a the cakeboard and are glue to it to make it stay put.
3) the seats in front help hold down the cakeboard so it doesn't flip -- how? mold wires into them that can attach to main base board (or go through it and be locked in place on bottom). OR put heavy fondant figures sitting in seats to act as counterbalance weights.
make the tiers as wide as "looks right" given the length cake.
to raise it up so looks truly off the ground -- short dowels along what would be the axle line of the wheels -- if base is strong enough should only need 4 -- one hidden behind each wheel supporting the board. the dowels should be at least a 1/2 in or could even be a small blocks of wood.
for added safety the whole construction sits (and if possible all the dowels are firmly glued/screwed to..) on a plywood or other very stiff base.
, DOUG YOU ARE THE GREATEST!!!!!!!!!!!!!!!!! I had been thinking all afternoon at my mom's about this and I brought home some little spools to raise it up..This is for my big brother b-day so I was going to make a person sitting in it..and he's big!!! (so there's my heavy!)
Thank you again soooooooooooo MUCH!!
Any suggestions on the best type of cake to use if you're gonna do 3D/sculptured cakes?
Thanks!
Deb
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