Help me choose a pickup to tow (w/a side x side )

I currently tow a '09 Chevy Silverado half ton extended cab 4x4 with a 6 1/2 foot bed with and M and G braking system. I carry a side by side UTV in the bed of the pickup and want to continue doing that. I'm leaning toward a Chevy or GMC because of the M&G braking system may transfer easily but I am open to any brand.

I want: A true 4 door.
An 8 foot bed but must have a 6 1/2 foot bed.
Must be easily set up for towing without modification.

Thanks for any input. Max.