Yes four adults can sit in a pony trap provided that they are not too heavy and that the pony is sturdy and not too old. (Hope it's not a childs pony and trap)
It's not possible to say how far it can go without knowing the above and the journey- hilly, boggy, main road, bye road etc.,etc.Will he be well shod for a main road?
Will you have an experienced driver and will he/she be a fifth person.?
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