I'm not sure why it won't work as is, our 2011 X17Z had the LP tanks against the trailer and the battery in front, it worked out fine. If this is a new unit, the dealer should be able to get this to work. Here's a pic showing the snap up brackets. We did have to lift up on the LP cover a little to swing the bar up, but otherwise not a big deal.
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2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
ITBC
Reese "Pro Series" 800lb Trunnion WDH w/sway control