If you decide to lag bolt it to the floor(which is the ONLY way I'd go) make sure you find a stud or stringer that you can tie into. If room allows, do two chocks, this way if you bring a buddy's bike your all set. If you're concerned with voiding any warranty, call the factory directly. Sounds like the dealer doesn't wanna take the time to accommodate you. If the factory pizzes and moans, the warranty is usually only 1 year anyways.
2010 Cedar Creek 5th Wheel 34SATS "The Beast"
2006 Ford F350 Lariat 6.0L Diesel
2003 Harley Heritage Softail "Hogzilla"
1988 Harley Softail Custom "The Fireman"
1986 Marriage to "Wifey" (patience of a saint)