Okay, I figured it out. I was configuring an F250 Super Cab. The Super Cab is not available with the Lariat Ultimate package - the Ultimate is only available with the Crew Cab. And, the Ultimate package is required if the LED headlights are optioned. So, an F250 IS available with the LED headlights if the Crew Cab is chosen.
I hadn't noticed that a 4X4 was required for the goose neck prep. So, went to the build and price, and behold - you are right again.
I want a 4X4 anyway, but I find it interesting that the 4X4 is required. There must be some reason. But for the life of me I can't figure out why. I'd certainly want to learn more about it. There might be some fascinating engineering problem I haven't thought of.
My 2011 F350 SRW LB 4x4 has a 11,500 GVWR and a 23,500 GCWR. Looks like the same configuration on the '17 has the same GVWR, but a 28,200 GCWR. That's an increase of 4700 lbs. Wow! Can that be from the new boxed frame?
The Advanced Security Pack is standard on Lariat and above. It's an option on XLT. What does it do? Yes, I read that it has an intrusion/inclination sensor. So, what does it do if it senses an intrusion/inclination? Set off an alarm? Disable the ignition?