I see you live in CO. Land of the Rocky Mountains. I suggest a more aerodynamic trailer such as Casita, Scamp, Weiscraft (made in CO), or similar. Or go with a popup.
I have a 270 HP '08 Toyota Highlander. It did fine with a molded fiberglass Burro TT, but with a KZ Escape E14RB (2700 lbs loaded) the HL really struggled on long grades at higher altitudes. Elsewhere it did okay. But I got worried after seeing the transmission temp light come on several times last year, so I sold the KZ and bought an Aliner hard-sided popup.
The difference between the 2200 lb Burro and the 2700 lb KZ was not the extra 500 lbs, but the extra wind resistance of a boxy trailer. A rounded shape that sits a bit lower and/or narrower will make a huge difference. I averaged 14.3 mpg on a long trip through CO and UT with the Burro, and 12 mpg towing the KZ on a similar mountain trip. Both at about 60-62 mph typical speed.
By way of comparison, I just got back from a 800 mile round trip to Palo Duro Canyon with the 5' high, sub-2000-lb Aliner. 15+ mpg on the way west (elevation gain and into wind), and 17+ mpg on the way back... driving 65 and sometimes 70 mph.
Mike G.
Liberty is meaningless where the right to utter one's thoughts and opinions has ceased to exist. That, of all rights, is the dread of tyrants. --Frederick Douglass
photo: Yosemite Valley view from Taft Point