Here is a diagram I drew up that hopefully be of help. 
Look it over and use it as a guide if you want. 
It is meant to show the size of radius and the depth of the radius have a bearing on the over all look of the end result.
Gary
			
			
						Cab roundover
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Cab roundover
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									In the 60's people took acid to make the world weird. Now the world is weird , and they take Prozac to make it normal.
						