Larry and Margaret,
Your question was specifically about trailers and others more knowledgeable than me have responded on that.
On the off chance that an alternative way of avoiding lifting the canoe to the roof of your Forester would be of interest, I thought I'd share the following solution that is working for me.
The Reese canoe loader, pictured, allows you to lift only half the canoe's weight at a time. The adjustable vertical support is mounted to a trailer hitch. You lift one end of the canoe onto a rotating T-bar, attach a shock cord to temporarily secure it, then lift the other end and walk it around to the front while the first end swivels on the T-bar. Then you strap the canoe to your racks as usual and tie bow and stern ropes. I made pads for the roof racks to protect the gunwales.
Unclear whether Reese still manufactures these, but we found one on FB Marketplace.