I wouldn't worry. JT is going to have a much larger bed, over 5 ft. A real pickup truck and one that isnt such a Wrangler carbon copy as shown in the renders.
What needs to be done right is everything you don't see. Payload, towing capacity.
Several people with intimate knowledge have said this is very close. We're getting there. FCA should be driving around more scantily clad JL prototypes soon.