This is going to sound very dumb…I'm not able to look at my paperwork and can't measure my bed at the moment. I'm wanting to setup my appt for my Line-X and Tonnaeu cover install but I'm not 100% my bed size. I'm pretty sure it's a 5.5 box but don't want him ordering the wrong cover length. 2015 Platinum 4dr and I know it showed 145" wheelbase. My OCD's are wanting to verify this before making the call.

 

If it is a crew cab, 145" wheelbase, then you have a 5.5' box.
If it is a crew cab, 157" wheelbase, then you have a 6.5' box.

 

Thank you, I was pretty sure but wanted to verify before placing my order.