I do wonder if Raina and Po picked the exchange site to cut the chances of sniper intervention and contain the damage that could be done by sniper fire. Probably.
Unquestionably. Those trucks weren't there by accident. Centipede chose to stage the exchange on a bridge between two large trucks specifically in order to block any snipers or cameras, so that they could pull the double cross. And of course they rigged the trucks to blow afterward to cover their getaway.