Damn! You use a 16 foot trailer? How much stuff do you have? I have rented a 6 footer on a few occasions and I could fit all my bands gear in it twice, and i play a fridge and the guitar players both use 4X12 cab halfstacks. With a normal 5 piece drum kit. Granted our PA is on the smaller side and we have no light rig to speak of, but we rarely need to take that kind of stuff anyway.
This is it right here. In our market, 9 gigs out of 10 you bring your own production or you have to hire it out. And the gigs don't pay enough to cover hiring it out. Our band's trailer is about 16'... but we roll a pretty substantial P.A. (4 to 6 subs at 2x18 each, 4 tops and 16,000 watts of power amps), a full light show (trussed backlights, crank stands, moving lights and an LED curtain), and all the power cords, XLR cables, brackets etc. to hook it all together. That stuff is heavy, and takes a lot of space. We put on a hell of a show, but it's not cheap to do... and we charge accordingly.