Yes, be careful to downshift (as Doug mentioned) when the engine "loads" up (on a grade). The 5th gear in your transmission is less than 1:1, smaller than the lower gears and very easy to overheat, under a load, and be destroyed. Most automatic transmissions vehicles recommend not using overdrive for towing anything, regardless of the vehicles towing capacity. The same thing will hold true for a manual transmission vehicle. Speaking from personal experience.