I have a Dodge Grand Caravan that’s has a towing capacity of 3,500 lbs with which I make relatively short towing trips pulling a Lund Explorer 1700. I’m guessing boat, motor, and trailer weighs about 2,500 – 3,000 lbs. The van tows the boat okay but is not ideal. When pulling up the big hills between Everts and Prescott I’ll slow down to about 40-45 mph. And steep or icy ramps are a problem. I can pull the boat out of the Lion’s Levee ramp in St. Paul Park which is moderately steep ramp.
Towing is one thing but stopping is another. I’ve got disc surge brakes on the trailer which is an absolute must-have when towing this much weight with a minivan (or even most if not all SUVs). I’ve never felt that the boat was pushing the van while stopping. I think the maximum towing weight for the van is only about 1,300 lbs if the trailer does not have brakes. I’m guessing the maximum towing weight of your 4Runner is only about 1,500 lbs without the use of trailer brakes so I suppose your trailer already has them.
Boone