Just a heads up, keep in mind that a trailer's loaded tongue weight is supported by the TV, thus the weight is subtracted from the TV's Payload Capacity.
If you get a chance, run your "loaded" 4-Runner and 1206 PUP across a CAT scale to dial-in your set-up.
CAT how-to:
http://www.jaycoowners.com/forums/showthread.php?t=3871
A little note on published Tow Ratings:
http://www.jaycoowners.com/forums/showthread.php?t=3866
IMO you should be fine, but we all have different loading habits and a CAT scale visit provides a little towing confidence
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)