Why hasn't Budweiser ever had someone make a corporate beer delivery semi like this? Everyone else in hot rodding has used a keg as a gas tank, why hasn't Budweiser used an oversized one for delivery to events?

This is the artwork of Chris Brown, http://brownautodesign.com/  I found it in Masters of Chicken Scratch Vol 2

Caradisiac posted a couple European ones http://justacarguy.blogspot.com/2010/10/trucking-used-for-advertising-quite.html but nothing this cool