Rear step bumper and towing (such as comfort-step)

I'm going to modify my pricing quote, as that $1100 number included the frame mounts I bought at the same time. I think the hitch & extension were about $900 for the parts, & I installed them myself (easy job).

The bumper definitely adds to the extension needed, but only by the several inches more than a normal bumper.

And no, the steps cannot move from center, at least as the factory mounting is.

Comfort step is nice- Im unsure but does apear it'd add to length of tow extension? Adventure does discuss this and still offers standard bumper http://www.truckcampermagazine.com/news/tcm-exclusive-2013-adventurer-announcements.
Either bumper-at least in pics I dont see brackets to offset the step for use when hitched?

We purchased an Adventurer 910FBS in January with the Comfort Step....what a GREAT option!

We also tow something about 90% of the time...sometimes up to 8,000 lbs.

With our previous 9' camper, we used a Titan/Tow Beast with an 18" extension. With this longer camper & longer bumper, I only felt safe with a full TorkLift hitch and 36" truss extension. It was expensive (about $1,100 IIRC), but that's what peace of mind is worth, not to mention the safety of others on the road. Worth every dime I say.