In the tabletop I really loved the urbanmechs (if the other side had em) paperthin armor and limited mobility is always great if thats what the enemy has...
Since not all combat is in cities most poeple would become quit sad if they are easily flanked and subsequently ripped apart be a single volley of an enemy mech. In other words in most environments most people will be unable to make effective use of the trashcan.
I also like the urbanmech when I GM, a player that was for any reason annoying and had done something (such as walking over the commanding officers car ^^) that warrented a punishment, he was demoted to trashcan duty. Most were very disciplined after one or two battles in an urbanmech ;-)
If you wish to drive a trashcan thats ok but then it has to look like a trashcan with a complete trashcan skin ...
Edited by Fire for Effect, 27 June 2012 - 11:22 PM.