I didn't give you the specific page at Smitty's website for the information you need. This page will give you information about the disconnect and lube pump.
Driveline Modifications for Towing -- Smitty's RV & Welding
They can give you advice on which is the way to go but the disconnect is probably the most desirable as has been pointed out but talk to them to get their take on it. As they mention, some vehicles require a lube pump but I don't think your pickup would necessarily require one so hopefully you can get fitted with a disconnect.
Let us know what you eventually do and where you had it done if not at Smitty's.