Sounds good, my wife use to be into dressage, it's a tough disipline. I would like to see the pics when you get them.
Just a word of advice, completly my opinion, with a qualifying question. Was your trail ride somewhere the horse was use to going, was he comfortable with familar surroundings?
When I buy a horse and spend what I would consider enough money that I would have to work at getting it back in a resale, I get a contract with a 30 day trail period in it. Meaning all horses (for the most part, maybe not a 30yr old horse) have a "honeymoon" period. It last about two weeks, they are good to handle and are geting use to the new enviroment, but after two weeks the start to push you and test the boundries. If an evil horse comes out it's nice to have a 30 day return policy with a full refund to you. This policy usally includes the buyer paying for vet exam upon return of the horse. The vet is of the sellers choosing.
Anyway just a thought. Oh and I have argued before on these boards, as some can tell you, that there is no such thing as a bombproof horse IMO, "any horse, any day."
Don't get me wrong, If I was wanting to buy a horse and went on a FUN 5 hour trail ride with little or no trouble, I would be in love with that horse and would be sold. I would just CYA a little if I was what I consider to be big bucks.
JMO, love to see pics.
Alan