Check with Toyota to make sure that a driveshaft disconnect is all thats needed for 4 down towing. If it is, and you have to do that regardless whether 4 down or dolly towing, I would definitely think 4 down (towbar) would be the way to go. That is, unless you need or want the versatility that comes with a dolly (ability to tow other vehicles, no other modifications to towed vehicle, etc).
If I had to go through all the 'fun' of installing a driveshaft disconnect, I'd definitely want to go 4 down, but like so many other things, its personal preference, and there is no one size fits all answer. Each choice has its pros and cons.
If you do decide to go with the towbar, I will say you made an EXCELLENT choice, on the ReadyBrute/ReadyBrake system. You just can't beat it - towbar AND very simple, effective braking system all for about the same price as you'd pay for just a tow bar in many other cases (and still have to spend another $1k for a brake system).
Will & Angela
2 children that love camping, Stephen & Allison
2012 FR Georgetown 351DS on F53 (V10) Chassis Our Rig
If the 4 Runner is a 4x4 disconnecting the rear driveshaft may not allow it to be towed 4 down. heck the owner's manual for recreational towing. Depends a lot on the transfer case used. Our son's Jeep has neutral but there is a viscous coupling between drive shafts that doesn't disconnect. On my 85 Ramcharger it is all gear and chain so when in neutral everything is disconnected front, rear and trans.
Ray, Cheryl, Cory & of course Miss Molly the four-legged child