I see you have a 2003 gmc....i have a 2005 GMC..and the trouble I had was finding a power jack that would give clearance to my hatch when connected to the trailer. the one the dealer installed did not allow me to open the back of the truck...i knew that was going to bug me so i had them remove it and take it back. BUT MY PRAYERS WERE ANSWERED.. i found this one online
Bulldog 3500
It lifts the trailer and my truck high enough to easily get my weight distribution bars on and there is plenty of clearance for the tailgate to open when hitched. It also has a 5 YEAR WARRANTY.. and I found it on Ebay for $189.99.
It also has the drop leg which is great because then you do not have to wait forever to jack up the trailer. Has a lite for night hitching and also a manual override that is actually easy to crank.
I hope yours works out..but if not...this is the one for you.
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2014 Keystone Passport 2920BH
2005 GMC Yukon 5.3L 3.42 ratio with trans cool and
Heavy Duty Tow Package
Pro Series WD Hitch with Dual Sway Bars.
Previous trailer was 2006 Fleetwood Orbit hybrid 20'