As of the current model year...Landmark, Bighorn and Big Country are all warranted for fulltiming! As a side note...we've been fulltiming in an '08 Bighorn since July 0f '07, and have never had a warranty issue that Heartland wouldn't honor, and they knew from day one we were fulltimers...now they just put it in writing...
See post #9 of the thread below...
//heartlandowners.org/showthread.php/23076-questions-about-Bighorns?p=169014&highlight=#post169014