Designer 35RLTS and Jayco Talk...Thanks Frank!!

I am new to this forum and will soon be purchasing a new 35RLTS. My TV is a 2006 GMC 2500HD duramax. It is a crew cab with the short box. I have been thinking all along in my thought process that I would need a slider hitch, but I was told today by a Jayco dealer that they have extended the pin box on this unit and the slider was no longer necessary or recommended.

Any thoughts from the bank of experts here?

Thank you.

Ed