According to my research your 2015 Winnebago Itasca Ellipse Class A motorhome is built on a Freightliner M2 chassis. If your manual indicates this, and that this (impressive) motorhome has an 8K-rated front axle then we do offer a front anti-sway bar from Roadmaster.
Part # RM-1209-116 is a kit that includes the sway bar, bushings, mounting brackets and hardware.
The linked photo illustrates the kit components.
The rear sway bar you referenced fits only Ford F-53-based motor homes. view full answer...