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Betty Crocker has a great video of how to bake and assemble a firetruck cake. Maybe you can get some ideas from that for your monster truck.

http://www.bettycrocker.com/recipes.aspx/fire-engine-cake

This site has great pictures of monster trucks and how they were made. Some are very creative!

http://www.coolest-birthday-cakes.com/monster-truck-picture.html#c1

I have made shaped cakes and it really helps to put a very thin coating of frosting on the cake and let it dry real good before applying the rest of the frosting. It will keep all the cake crumbs from getting into the frosting.

I especially liked the cakes that used crueller donuts for the wheels. Maybe you could place the donuts on a wire rack and pour fudge ice cream topping over them and let it dry. Maybe even the kind that hardens?

I think you could bake a 9x13 cake and cut it down the center. Cut one side the length you want the truck and cut a piece of the other side for the truck cab. Set the cab back enough to have a hood in front. You could use loaf pans, too.

Because the truck will have to be high because of the tires, you will need to use some sort of support under the truck. I think I would cut a cake board the same size as the truck, cover it in foil and put the truck on it. Then you could find some sturdy supports that are about the height of the donut wheels to set the truck on. Then each donut wheel would hide the supports...maybe 4 jars of baby food, or 4 cardboard salt/pepper shakers.

I just looked in my pantry, and I think you could use 2 boxes of Jiffy cake mix or cornbread mix to set the cake on....one box between the front tires and one between the back, kind of like an axle. You could cover the boxes with foil and even frost them with chocolate frosting so they won't show as much.

Then you could set the everything on another full-size cake board. A large dab of frosting on the bottom of the axle boxes will help secure them to the cakeboard...and a large dab on the top of each box will secure the truck on top.

You could crush chocolate cookies and use graham cracker crumbs to make a "road" on the cakeboard. If you use a chocolate cake mix for the truck, you could use some of the leftovers after cutting the truck out to make big piles of "dirt" or hills.

Good Luck!