use the polygonal lasso tool and then select the whole picture except for the bottom portion including your wheels and the ground. then cntrl+C to copy it and cntrl+V to paste it. then use the mouse to drag it down to an acceptable level. clean up your lines and blend it and your done.
Select the bottom edge of the body of the vehicle and the background above it. in other words, once you get to the front bumper just go straight outta the screen and include the surrounding background. repeat with the back bumper (assuming your using a 1/2 shot picture). After making your selection, it be best to copy the selection and paste it as a new layer. (Ctrl+C , then Ctrl+V). Then use the "Move" tool to move the body of the truck down on the rims.
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