Does the Ridgeline have a trans cooler option? Just something else I would think about.
One thing my dad got through my head when I was younger is "Everything works until it doesn't. It's the doesn't part you need to worry about" This was his answer to many of the goofy ideas I may have had as a teenager.
So to apply that knowledge, to this situation:
Something is bound to go wrong eventually; that goes with any tow vehicle/trailer combination. But what does that look like? With a true 1/2 ton and a 21 ft trailer, it could be a blown tire, or stability issues on windy days. On a smaller vehicle, like the ridgline, those issues could be the transmission prematurely giving out leaving you stranded, stability issues in the slightest of winds, etc...
Admittedly, I tend to overdo things. I usually have to much tool for the job. But it is about peace of mind for me.
One more thought before I end my rambling. If you are getting back into camping, you obviously like it and it is something that hopefully relaxes you and gives you an escape from the everyday stress of life. I would hate to see the thing that is supposed to bring you that relaxation cause you more stress/anxiety due to equipment failure that could have been prevented.