Nissan Armada Tow

I have a question for any Armada owners. Considering buying a new one and coming from a 2013 Dodge Durango w/ the Hemi. The Dodge has more HP and about the same TQ but Im down a bit on payload so nee to upgrade and am just not a 'truck' guy. The Armada has about 1500# payload which would be fine for me. I have a 26' TT that's about 6200# loaded w/ less than 800# tongue weight. So how does it do towing on hills? Its less HP than my Durango and has one less gear in the transmission so as I tow through mountains, I am worried it may have to hunt around for the right gear and be winding out at higher RPM's for longer periods of time. Looking for some real world experience from any owners who can shed some light. Thanks!