If you like the big boys, they'll be fine for you! There's a full Clydesdale where my horse is kept who is used only for trail rides and does super. I also know a few Training level draft crosses who do a really good job (I think they're Belgian crosses).
Since you want to trail ride, you want a well broke horse. Something calm and maybe a little older - say 10 or older. I'd keep away from unfinished horses unless you feel confident doing the training yourself. Be absolutely sure you gen a prepurchase exam - even if it's a free horse. I don't know where you are but I'm sure we have members here who can suggest where to look for your area.
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