My XLR Thunderbolt had the same issue, mine was because of a kinked propane hose under the slideout. It was a bad design in my opinion (the fitting should have been a 90 instead of a straight fitting) but by getting some more slack in the hose and removing the kink, it now works fine.
-John
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2015 XLR Thunderbolt 375
2015 GMC 2500 Denali
- Anderson Hitch
- Air Bags
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