Burro has been out of business for a couple of decades, so the best bet is another owner of the same model. Surprised one hasn’t been along already, though the wide-body models are definitely less common.
The OP could use the community search tools to try and identify an owner who is currently active (check their profile to see when they’ve last logged in). When you find someone with recent activity, reach out by e-mail or private message.
With such an uncommon model, you may have to be proactive to connect with another owner. There's probably a FB group for Burro owners. Rallies are another another avenue. Some
rally hosts ask about trailer make and model when registering participants, or they may have personal knowledge of someone with this model.
I also got several hits when I searched this site ("Search Site/Google" option at the bottom of the search menu) using "Burro 17 frame" as the query.