I recently bought one and have to agree it is easy to use and quick to the empty can. I used to have a 14 gallon on wheels that gravity fed the gas quickly but it was too heavy to lug around. Carry 5 gallon cans and super siphon.
I was looking at the super siphon of even a shaker siphon. The hose diameter is bigger than my clear hose so it should fill a little quicker. I have to use gas cans because I don't take mine out of the water. I don't own a trailer.