Boat + Trailier + Gear is around 4500lbs. Then add 3-4 people riding with me in the 4runner. The two ramps I launch at are 0.8miles away (private) and 30 miles away.
The runner tows surprisingly well. Power-wise it has plenty of torque to get it up nearly a 45degree hill (maybe really 20-30, its steep and .1-.2 mile long) I take to get to the private ramp. Weight-wise the boat can jerk it a little on the bumps, but not uncomfortably.
One of the other owners has a 5.3L Tahoe; its a little smoother but not any faster