I've towed mine over 600 miles round trip with a 2.2L Celica with little noticable drag, so the back of your pickup should fare just fine
:
Gas mileage ftw
Although I'm mad jealous of your ability to just load it in a truck and actually be allowed to drive speed limit and not get stuck in the crappy truck lanes going <55 mph up the Grapevine.
Ahem, yes. I'm not even bitter about it, I swear