Both are very cute. My Buster drives. I trained him with help from Barbie Black and he is actually the reason I drive now.
Training donkeys is very different than training horses. They are very smart and I truely believe they are smarter than horses. However, that means they are opinionated. Going around in circles makes no sense to them. I ground drove Buster but never taught him to lunge or long line. I taught all the verbal commands by ground driving.
He also didn’t see much sense in going around the ring. However, he loved going on trail drives and on the road. When he was fit from that, I could insist he work in the ring but he still didn’t like it. When fit and going, he had 3 trot, backed and did water crossings. He was the Reserve Champion VSE at our Pleasure Driving Show one year when he was seriously in work. He also one the Carriage Dog Class with my fiest. There is a picture of him on the ADS website Carriage Dog show.
When I started driving a horse, driving Buster was slow and trying to do 2 was almost impossible. So now he is mainly a babysitter.
If you plan on driving the 2 as a pair, you want to think about a 4 wheel vehicle instead of a cart. Carts aren’t really meant for pairs.
I use a Camptown harness, B size and had a larger bridle made. I used a frontier easy entry cart with him.
I can send you pictures but I don’t know how to post them here. PM me and I can attach them to an email.