The most damage I have had from a horse was a blind mare I had didn't travel well and would chew on the divider.  She would scrape all the paint off and it would rust. 

I had a friend who had a 2 horse BP and her gelding kicked the sheet metal off the door.  While she was doing 60.  She had the sheet metal replaced and 1x6's (or 2x6's don't remember which), installed into the channel that was already there.  The door had the channel for the wood, but it was missing.   She bought it used so there was no warantee.  Insurance covered the sheet metal and paint, she paid for the wood.

What a can o' worms!

Problem:  (Divider)I've had horses get into it while in transit and move a divider out of it's pins front, rear and sometimes both...approx three times.  (long learning curve on my part)

Fix:  I've drilled through the end of the pins and placed cotter pins through the holes so the divider cannot be pulled and knocked out of place unless the cotter pin is pulled first.

Problem:  (Door restraints)I've had the tail curtains over the top of my ramp rip free of their restraints and bend the doors.  (windy)

Fix:  Thank GOD I have a steel trailer and a great welder, $25 better than new.

Problem:  (Kicking at side walls)I've had horses peel my rubber mats from the side walls(straight load)during transit over time with their back feet.  I find this more of a problem with really tall horses 16.1+ and rear shod.

Fix:  Clean the walls and back side of the mats and apply adheisive per instructions and stick the mats back on the walls.  It's never like new but then once a trailer is used it's not new.

Problem:  (Bent ramp)I've had horses get into it and bend my ramp.  Standing at the end of the trailer looking across the width of the trailer you could stick your hand inside the bow.  The ramp still worked and work was put off, damage was only cosmetic.

Fix  Ramp was fixed at the factory because the trailer was given a birthday present after all the work mentioned above it deserved it!  (The trailer was roughly 15 years old by this point, maker couldn't believe it's near perfect condition.  Pictures of the trailer were taken by the maker, maybe they are on the walls of the office?)

I will say that I've easily put 100's of thousands of miles hauling during my experiences and I have hauled many first timers and crazy half-cocked hunters so to say that this is all that has happened is really an honor.  I love big horses and when big horses have a problem they can cause big damages.  Big babies are even worse!  I still use and love this trailer and never plan on selling it, I'll keep it as my run around trailer.  It is by far the finest steel trailer I have ever seen, even to this day.

My worst trailer damage is from a rescue that tried to jump out of the drop down window.  The aluminum frame around the window got mangled and needed hammered back into shape to get the window closed.  I never thought about turning it in on warranty work, as it was a freak accident.  The lady we got the rescue from was holding the filly in the trailer while we loaded the 2nd rescue colt, she let the rope get too long and the filly tried to escape through the nearest "exit". :-(

My 1300# mustang paws the trailer, but the aluminum Featherlite is taking it well...  Other than some mini-scrapes on the rubber wall panel, there's no damage.  He whacks it hard enough to rock the trailer while I'm driving, I'm glad/suprised the damage isn't worse.

Happy Trails,

Michelle

When I picked up a big filly, her first trailer ride, she kicked the #$#% out of my brand new trailer.  Only slightly dented a divider.  Because the horse area is triple walled with steel sheets, no damage.

My stallion paws, but does no damage to the rubber floor mats.