Yep the 1.5" Boras will deffinitly give you what you need! They allow me to run my 13" wide duratracs on stock 20's. I believe 1.5" is the thinnest adaptor you can get without having to cut the factory studs.
BORA are rated for 30,000 lbs so towing with them is not an issue.
Just remember to torque them to the truck at 120 ft. Lbs of torque, but torque the wheels to the adaptors at 80-100 ft.lbs. I believe mine are at 95 lbs.
Lenny at Motosport Tech is fantastic to deal with. I've been an advocate for you get what you pay for, and thats truly the case with BORA.
Stock 20's with duratracs
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