Realistically 3.90 or 4.10 are quite high and either ratio would work well, the 4.10 would give you slightly less fuel economy when not towing and the extra torque it would provide would be minimally noticeable, more of an issue when off roading and low speed high torque is required.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70