socalrob:
12 mpg - that's great - what are you complaining about?! I have an 89 F350 dually with a 460 gas, 3 speed automatic, 4:89 rear end and it gets a whopping 5 mpg whether fully loaded or empty, it doesn't really care!!!
When it comes to hauling horses the thing to keep in mind is that it's a "live" load and it will move around. A dually helps, but not really necessary. My new F250 isn't and while we can "feel" the trailer more it's not a safety issue. A gooseneck will pull better because the rear axle is bearing some of the weight of the trailer. A bumper pull is ok for short trips but they can get squirrelly.
As with hauling anything it's not a matter of "can you pull it" rather "can you stop it"! Most good horse trailers come with trailer brakes and they are a must. We have a small two horse bumper pull right now but with the new truck we're going to move up to a nice 3 load slant goose neck with a little camper up front. In my opinion Sundowner
http://www.sundownertrailer.com/ makes the best trailer. Aluminum skin on a steel frame, high quality stainless steel - horse safe - hardware, you can't got wrong.
What kind of horses do you have and what type of showing? We have 2 old style desert bred Arabs and 2 Friesians - gelding and mare each. The Friesian gelding is a 4th level dressage horse and the mare is used primarily for breeding. The Arabs are the woods horses - I've been wanting to give the guys over at advrider.com a ribbing by posting a pic of my little Arab out in the woods with the caption: the Ultimate Adventure Ride"!
jb