So maybe our towing experience this afternoon will bolster your confidence a bit. We have been towing our rig to and through West Texas (Davis Mountains - ~6000' ASL) and now into northern New Mexico (Sangre de Cristo Mountains). You can understand that we have been climbing steadily from the plains of the Llano Escatado of SE New Mexico ~4000'+ ASL to our present campsite in Red River, New Mexico. None of our numerous grades today presented a challenge to our '18 RTL-E, and our TFT ranged from the low 200°F to the low 220°F. Ambient temperatures were in the low 70°s and dropping into the 60°s as we climbed higher (it will be in the mid 30°s tonight).Holy balls this new forum software is a no go.
Anyways, sorry if this was common knowledge to many but it is in fact correct that you can not see TFT with Bluedriver. Kind of a bummer since I already have that.
I am going to be towing at 5k lbs a few times a year in a more cool climate but still don't want to fry the transmission of course. @Last Train post does give me more confidence in the Ridgelines capability.
For example, leaving I-25 we turned west on NM 58 and then US 64 headed toward Cimmaron Canyon State Park. This was a steady climb that took us through the park's winding US 64 at speeds as low as 25 mph to a maximum of 45 mph. The truck performed beautifully with TFTs as noted above - with one exception. There was one grade at low speed (due to the winding highway) when the TFT creeped up to 226°F, but it quickly dropped back to the lower 200°s after the grade was crested.
And in this afternoon's approach to Red River our truck was an absolute champion in its most difficult challenge to date: climbing and then descending Bobcat Pass. (Our travel trailer for this trip weighed 4650lbs with a tongue weight of 490lbs.) Heading north from Eagle Nest this pass has a 6%-8% uphill grade for 2 miles with curves with speeds varying from 25-45mph. The summit has a sign posting the altitude at 9820' ASL. No problem at all maintaining the posted speed limits on the way up, One interesting thing I'll note is that on the way up Bobcat Pass, there were two 1/2 ton pickups following me, and they were not towing anything, but I never held them up. There were multiple opportunities for them to pass us, but neither ever made the attempt.
Finally, the northbound downhill descent into Red River is about 4 miles at a 7%-8% grade with 30-35mph curves. I know that many have expressed concerns about the Ridgeline's brakes, but despite towing almost 4,700lbs on that downhill run I never had any sense that I was "on the edge" of losing control. I used the accepted mountain driving technique of cresting the summit at the target downhill speed, then as you accelerate, stab the brakes hard to slow down below target speed and release to allow the brakes to cool (both truck and trailer). And I dropped the tranny into Low. In summary it was a confident run both going up and coming down the pass.
Hope our experiences will give you a context for confidence in using your truck as you noted in your post.