So, unexpected development. Yesterday I tried step one of the protocol–keep everything exactly as it was and watch with the camera. I put the camera in the trailer, facing Maresy. I had a clear view of the divider and her hip at all times from the driver’s seat. I drove down our very bad driveway and steep, rocky road, made turns onto the pavement, got up to 50 mph, went down another dirt road and made a tight turn to head back, accelerated hard uphill, another right turn, then a left, the up our hill, which jolts both trailer and truck around quite unpleasantly, even at slow speed.
Maresy did not lean on the divider even once
What am I to take away from this?
I think what I should take away is that I simply didn’t give her enough time to adjust to the new trailer. It arrived, I was eager to put it into use to see if I was safe to sell the old trailer, but I had long trips I had to take–45 mins to the trainer, down a bad road to get to our regular exercise ride, and then, I took her on a three hour haul, one hour of which was up an incredibly bad road, and then all the same in reverse two days later.
I noticed the leaning from the start, but the wounds weren’t there until that last haul, over a road so bad that even with my transmission locked in first, I had to ride the brakes for an hour to get back to a decent road. I had never been to this location before and didn’t know the road was that bad.
So I think she may be okay so long as I go back to building her foundation with the trailer–load her every day and take her on super short rides, then gradually increase the distance and difficulty.
Also, if horses balance better facing in reverse, then I may have to be extra super polite with my driving (I always am, but maybe now even moreso) with her now riding facing forwards so as to give her more confidence with her balance.
The trailer as it is configured is what I need, and I’d rather not jerry-rig a way to open the divider to the side as it is sure to rattle around. Plus the mini can’t ride in there with the divider pushed to his side, and I don’t want Maresy getting used to that setup and then pitching a fit when I have to straighten the divider again.
So fingers crossed that it’s just that she needs time and opportunity to get familiar with the new trailer and I need to be a more sensitive driver. And hopefully she’ll be as relaxed in there as she was in her old trailer before I have to travel down another bad forest service road. Or I could take the divider out just for those trips.
I’m leaving the camera back there until it is too cold for the battery to work any more. And we’ll see how it goes.
And the chiro vet is hopefully going to make it out here today and will assess her fully to make sure this isn’t a physical problem with her.
Thanks for everyone’s thoughts and ideas! I learned a lot!