Trailer beer is defined by the trailer refrigerator.
The shelves in the trailer refrigerator are not tall enough for bottled beer. Bottled beer can't be stored vertically in the space available between the shelves. Canned Beer works much better, the cans are shorter so you can get more in the "refer". Anyone living in a trailer knows you need as much beer on hand as you can get. The problem is that most canned beer isn't that good.
So far I have found that only a few 'premium' breweries provide their products in cans. That is surprising because cans are the best choice in many situations. For example you don't want glass beer bottles by the pool, on the beach, at sporting events or in similar situations.
I have found that Heiniken, Tecate, Amstel Light are the most available. Occasionally you can find Corona, Newcastle Brown Ale and a few others. If anyone knows of any other beer available in cans, I'd like to know what kind and where It is available.
I was recently in the Save-a-Center on Carrolton at the same time a beer sales man was in their checking stock and gave him my full spiel about trailers and beer cans.
I'm pretty sure he thought I was nuts.