Having fun building a custom pad. 
I used a 20x30 sheet of dry erase board. It is rigid so it won't readily flex, has 4 LED lights that can easily be seen at night and a handle on the back for carrying from my garage or car.
	
		
			
		
		
	
				
			I used a 20x30 sheet of dry erase board. It is rigid so it won't readily flex, has 4 LED lights that can easily be seen at night and a handle on the back for carrying from my garage or car.