Did the dealer show you the "easy way" to set the WDH bars?
Hook the truck up to the trailer get the bars in place and crank the tongue jack up way up this will make it much easier to put the chains on once on then lower the tongue jack.. it is this reason that many go with power tongue jacks.
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12