Whats pulling your RPod

Just to give you a data point, we pulled a 179 with a 2015 Nissan Frontier with a 4.0L engine for about 50K miles. While the Nissan was up to the task, it did struggle in hills and spent a lot of its time in 3rd gear. We were limited by overall payload capacity and worse, range due to a smallish gas tank. We got somewhere between 9 and 12mpg, it seemed we were always hunting for a gas station, sometime after only 150 miles! At the time we lived in Albuquerque, NM and if we wanted to go anywhere, we had to deal with hills and wind. Things were a little better on the flats, but no matter, we stayed between 60-65mph. We used a Fastway E2 weight distribution hitch with built in anti-sway. 

Your Tacoma has one big thing going for it, it is a body on frame vehicle. I know folks swear that unibody vehicles work just fine, but I'm old school that way. 

Good luck and safe travels.