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					Originally Posted by  texken
					 
				 
				 JensR  do you think this motors might work?? 
DC Motor: High Torque Mini 12V DC Gear Motor, 50 rpm 
			
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 No, these are too small for Richard's large&heavy ADT. 
Richard, you may well be right and you have 10% extra speed with 13.2V 

As you already have the motors, I would suggest to just bolt/tie three or four (or all...) of them onto a wooden board and see how fast they go and decide whether this is acceptable to you. 
Just my $0.02, hope you don't mind - for me it's always very annoying to have to change motors and I try to test as much as I can before I commit to a motor and mounting hardware.
Cheers
Jens