I am pleasantly surprised at the performance of our 2017 Tacoma 2x4 truck. This was the first real test of the trailer and tow vehicle up a steep grade. We went from 4900 feet to Powder River Pass at 9666 feet. On the steepest grade we had in third gear at 3000RPM and about 48 mph but had no lagging and was able to accelerate as needed. The trailer is weighing about 3800 loaded.