"single warning lamp and then if desired a button for specific info.  For most things primary mode=minimal then a button press for details (applicable to maps also )"

"Nope, having 2 non-castered wheels also allows for much easier "straight" movement when desired, THAT is why only 2 casters are used."

"the critical factor is not the system, but finding similar sized containers at a good price (including shipping)...how about suggesting some container sources..(without stealing)?"