Someone may very well want this horse on Tuesday, in your previous posts you had stated that good horses are very hard to find in your area. If that is the case this horse sounds like it will sell quickly. I second the comment that not all horse traders are bad. Especially those that make their living at it. One bad comment could ruin any future sales. As much as I know you would like a PPE that may not be possible with a trader especially as riding season ramps up in your area. Unless your Vet is willing to do it in a day or two notice. As far as a trial period- if I were a seller that would be a no go for me so that may be hard to find.
I just drove 6 1/2 hours 1 way to see a horse. She was not as the seller described (way shorter, feet had not been done in 9 months, very obese) I was very disappointed when I got there. But after a test ride - her personality won me over. There are things we have to work on but it was the best $850 I have spent in a while. Keep your mind open when you look (moral of the story) the little mare I purchased has been pretty unflappable on the trail- but certainly was not what I had in mind for my next horse.