Might I ask WHY the horse needs to be desensatized to these
Posted via Mobile Device
I think this is a very silly question. Mayhaps the owner or any future owner will want to build a barn, or wants to measure something around the barn. That requires a tape measure. Mayhaps the owner or future owner will have the horses at home, where they also have a trampoline for their children. And mayhaps the owner or future owner will need to have the trampoline placed near the barn, or have to take the horse past the trampoline to get to the trails, the trailer, etc. So you ask why, and I ask WHY NOT? I'll desensitize a horse to anything it gets scared of. Like currently, my girls and I are working on bubbles.
To the OP. You are on the right track. Have you heard of the tie blocker ring? I've never used it, but you can run a long line through it and you can "crack" the tape measure, and if your horse wants to run backwards, you can let the line run through the tie blocker thing, and then bring her back. Then you repeat. There's a video somewhere online that showed a woman doing this while desensitizing a horse to hula hoops and such.
As far as the trampoline, I'm sure the fear came from the humans being so very high up. If it were me, I'd try to have a helper so they can be on the trampoline, and I'd be hand-grazing the horse close enough that the horse sees, but not so close it's nervous. Then gradully coax the horse closer, while the helper sits, stands, bounces a little, then bounces big on the trampoline. If the horse runs backwards, move with it [do not try to stop her or put pressure on the line] and when the horse stops, do a circle or two and bring her back to where she was. Then you repeat.
Good luck! =]