I agree with previous poster as you usually need to fill up the tank at that point.  If you have the drop down windows, I open them, let the horses hang out in the fresh air, offer water, but close up before taking off again. 

Do not unload at these stops as they could get loose and hit by a car.  Keep them in the trailer. 

370 miles isn't that long a trip as there are many on this board that go cross-country all the time and only stop for gas, driving straight through.  I prefer to stop overnight and like to find places that have pasture or paddocks, but that's my preference. 

370 miles is not a terribly long trip.  It might seem like it to you but it's almost an average drive for me.  I would stop for food and fuel.  If the stop is 10 min. or 20, that is plenty.  You can offer water but don't be upset if she doesn't drink.  She'll drink when she gets off.  I also would let that divider closed unless she is so large that she doesn't really fit in the stall area.  You don't need her to be moving around a lot.

Conventional wisdom says stop every 3 hours. But I'd rather drive straight through and get there faster rather than dragging it out. Of course,there is stopping for fuel and bathbroom breaks, other than that, just get there.

I personaly don't like them but my wife thinks otherwise...she had a horse get stung and go balistic....he trashed the trailer....and his lower legs....so now she always uses them...the one time she insisted I put them on I had a 300 mile haul in a two horse straight load with one horse....got to my destination one of the parties horses reached in and nipped him in the butt...he set back....broke the trailer tie...launched forward and put his front feet over the hay manger through the window in front...took some work getting him straightend out but the  only thing hurt was the trailer...boots do help! could have been bad lots of sharp edges....each to his own....slant loads kinda help that problem. Our horses are used to boots so they have no issues slipping or otherwise ....relay101..."just a helpfull hint" If the horse isn't used to them I wouldn't use em either. All the other subjects on hauling have been covered basicaly the same way we do it...

On that length of a drive I'd stop at a minimum of one time.  If I'm driving by myself, I have a rule that I usually will stop every two-three hours for about 15-30 minutes to give myself a break as well as the horse.  When your getting tired you'll make more mistakes and you don't have a lot of room for error when pulling a trailer.  I usually stop at big truck stops because they have plenty of room to move a trailer around and park.  They also offer everything I'd need when I stop; diesel/gas, food, restrooms, munchies and safety in number of people around.  I'll leave the back door open and I do offer water.  I have a buck with a lid and put it in my shower or bed of truck.  I always have a hay bag in front of them and I wouldn't recommend to grain any before leaving.  I find my horses don't eat or drink much while traveling.  I do take my divider to give them room and find they don't move around much even if they're by themself.  I also put down plenty of shavings for cushion and keeping it cool from a hot highway during the summer.  It also encourages my gelding to urinate because he doesn't like it to splatter on his legs. Would also recommend to have your trailer checked over, spare tire and a heavy duty wrench & jack in case of a flat tire. Have a safe trip!

We haul a lot and consider anything less than 300 miles a short trip.  When we stop for fuel, we make sure it's at least a 20 minute stop to let the horses rest.  We leave the horses in the trailer and offer them water.  Two of my horses will drink when on the road the other two won't, but I offer it to all of them. 

If the trip is going to be longer than 9 hours, about halfway through the trip, I will get them out of the trailer once and hand walk them for 15 or 20 minutes.   I get them out of the trailer only if I have a safe place to unload on dirt (not pavement) and it's a place where they cannot get onto the highway if they get loose.  I've found that fairgrounds are usually a pretty good bet when it comes to a place to unload and walk the horses.  If you ever travel through Amarillo, Texas the Big Texan Steak house is a good place to stop.  They will let you turn out your horses in good sized pens (they have 4 plus a round pen) for no charge while you eat lunch.

I've always read that because most roads are banked lower on the passenger side, the general rule of thumb is that, if you are hauling one horse they should ride on the driver's side.  If you are hauling two horses the bigger horse should ride on the driver's side.

I put shipping boots on my horses because I want to protect them from stepping on themselves or being kicked by another horse.  I make sure I put them on properly and my horses are used to them.  I've never had a problem with the shipping boots sliding down or scaring my horses.  If I am hauling a friends horse though, since their horse may not be used to them, I always ask if they want shipping boots on them or not. 

Hope you have a great and safe trip.

If you have never wrapped before don't.  Hauling alone it's not really that important.

I would only stop for gas and don't pull her out.  Don't let other folk touch her either...I don't open up my trailer when I stop so people won't come over to pet the pretty horses.  Germs are bad for horses under the stress of shipping, a little cold can get out of control.

Drive carefully and remember it's not about when you get there but THAT you get there.