Is this an HD or what.
I am looking for something that is adjustable on the fly. With my current one I don't seem to be able to ride more than 600 mi per day before I have to adjust it. My back gets tired quick.
yes - it comes with a variety of backrest pad styles. Check the online catalog. Pillow-Look Style Adjustable Rider Backrest
"These touring rider backrests are the most adjustable on the market. With one quick pull from the integrated gas spring, you can instantly adjust the riding position through a 30-degree range. The backrest removes easily and has a push-button-activated, five position, 1.5" height adjustment. The rider backrest folds down to allow easier passenger mounting.
Adjustable Rider Backrest Illustration
52473-01B
Fits '97-later Touring models equipped with slotted seats. Does not fit '08 FLHR, FLHX or FLTR Original Equipment seats. "
http://www.harley-davidson.com/gma/gma_product.jsp?PRODUCT%3C%3Eprd_id=845524442031391&FOLDER%3C%3Efolder_id=2534374302287457&ASSORTMENT%3C%3East_id=2534374302287457&bmUID=1215644718971&bmLocale=en_USIt is adjustable front to rear on the fly, and is also adjustable in height.