Thanks for the feedback!! I really appreciate hearing from those who have experience for something like this. I'm good at maintaining my mowers, trimmers, etc, but this is out of my league.
Any more thoughts?
I did check out the crate engines. They seem to be focused on performance applications. Driving my trailer/mowers through residential neighborhoods is not very exciting. Driving more than 40mph is pretty rare. "Laying rubber" was of interest 55 years ago, but now ... not so much.