Even the smallest slope will have you grabbing 5th or even 4th. It's painful, and that was the stock tires with 4.10 gears. 6th gear is a downhill gear.Are you constantly driving uphill? The Manual Gladiator with 3.73s I drove felt perfect, and 3.45 gearing won't be that much different. I can see the only real issue with it would be upsizing tires and I'm not sure OP would do that if he just wants a tow behind for his RV.