Probably not towing anything, but the math says still plenty capable... A 1078 with 5K onboard would weigh in around 21,500#?
With Ecos(3.9:1), a 3126B @~800ft/lb, at peak torque, should be able to deliver ~17,000# of thrust from the tires. It should be able to pull 24,000# up ~45degrees of...