... Ok and just put it on top of the tarp?
What if you cant get the horse to step on it?
What does cones on the sides of the tarp and pallets under do? ...
The plywood has nothing to do with the tarp. I would not put it on top of a tarp.
Hmmmm, just thinking though. As you both progress through working with plywood you could include a tarp. Maybe on the sides, or hung over the top. ..... Innovate, incorporate new ideas, come up with new ideas.
Next question, the first step is the most important one. Patience, patience, and by the way I do not suggest using food as I have seen some people try putting food on the wood. I prefer getting the horse to go forward when I ask.
Just patiently keep re-positioning her in front of the plywood, and when she relaxes there ask for a foot forward. If she dances away, keep her nose pointed at the plywood (where you want her to 'enter') and keep pressure on til she is at the spot then immediately drop all pressure, wait for her to compose herself on that spot, then ask again. Do not circle her, if she gets a bit too far around you, turn her back the way she came, not letting her complete a circle.
Third point: putting up sides. Is a variation of the squeeze game (going forward anywhere, anytime), and ever so valuable as a pre-cursory manuver to trailer loading.
With some horses I have used 4 barrels (one at the end of both long sides) filling the space between them with cones. With Chief I bought 4 plastic step in posts (under $2 each at TSC) and used some scary yellow caution tape I had on hand to string between them.
Have to admit, it assimilates a trailer fairly well, even with the hollow sound of stepping on the plywood.
A neighbor of mine has a pallet rebuilding business. I asked him if he could make me a pallet that fit the plywood and attach it. He kindly did that for no charge. Have seen people nail plywood to 2 smaller pallets though.
After we were pretty successful in the arenas, my board was drug out over a swale to make a 'real' bridge.
Have some video clips on my computer of it. Will try to make a YouTube account and upload them.