Andalusian thoroughbred

I have a 18 year old Andalusian thoroughbred gelding 17 hands tall. He would be best for trail riding (not a kids horse). He has only been with me for almost less then a year, I got him from a older couple. He does well with everything except loading into trailers and being tied to trailers due to trauma from the previous owners I’ve been trying to work with him on it but he needs someone who is willing to work with him and is more experienced then what I am capable of. Trying out the waters with selling him to a good home. Would make a great horse with better experience trainer. Willing to trade for a younger horse that hasn’t been trained.