full drafts at higher levels of eventing ? I don't know any. I hardly know any 1/2 drafts. I used to ride a 1/2 perch who when intermediate and believe me it was way more work than a tb and I didnt trust his ability to make it over some bigger fences.
I honestly don't like drafts as riding horses in general, but that's just me...i also don't like arabs so im not just a draft hater lol.
I would just say to anyone who wants a draft, especially a FULL draft. Don't be expecting a horse who can 'do anything' when it comes to jumping. Or jump high and athletically. You will be disappointed. If you want to play around with lower stuff, that's fine.
As I said, I personally wouldn't expect it. But it does happen time to time. I evented a draft cross intermediate and it was not an easy task. But it doesn't stop me from loving them. I would never expect one to do much beyond novice, possibly pretraining if I was lucky.
I'll stick to my Selle Francias, Belgian Warmbloods and TB's. To do higher stuff. And I do love me a nutty Trekky once and awhile