Though I haven't yet ridden either Can Am trike, I tend to agree that it should have ample power. I also like the fact that the company offers a trailer and a full warranty. 2f/1r is a layout that I like as well, having had a Grinnall Scorpion 111. I don't understand the criticism of the Can Am either.
Try this: BLOG.SPYDERFRED.COM
This is Fred Rau, he has a demo unit equipped with the factory trailer option. He rode it home (from Quebec I think) to CA with his wife and 250lbs of baggage in the trailer. According to him lack of power wasn't a problem. I suspect it's power to weight ratio is better than the one I have on my Tri-Glide. I'm thinking we will probably own one of these when we head out to Nova Scotia next June.
PS: nice to see a thread on the Spyder RT-S without someone bashing it.
Dwight