And if his question was which toaster to use next to his bathtub, would you recommend a brand and walk away thinking, "boy I sure wish he asked about safety"?
No insult intended towards the OP, nor am I lecturing if it sounds that way.
It sounded like they're somebody else's tractors, ("..from two different sources..") and he may not have a lot of experience with them. And that he has other options.
Sorry - pulling a wagon full of hay is one thing.
But when you're talking about pulling a wagon full of mothers, babies, and their great grandparents through busy city streets - in road gear - that's TOTALLY different.
I don't care what you think - a farmall H PROBABLY isn't the right tool for that job, and I don't mind saying so.
It depends entirely upon the size and weight of the wagon, and how many people are on it. And that wasn't mentioned.
- so I'm merely suggesting the OP consider the dangers carefully.
He Probably HAS, but since it wasn't mentioned - I'd rather do the guy a favor and speak up instead keeping quiet for fear of insulting him.