Hopefully if planning to tow you got/will get the Duramax/Allison, in my opinion you will have the best of both, tried & true tested combination. Mines 5 years old long bed dually dragging a 16.5k 5er for approximately 60k+ miles so far averaging 8.5-10.5 mpg towing at 65-68 mph. The newer ones have more torque & horsepower, quieter, & better ride than mine. Depending on the rv you plan to get you may not need the slider with the short bed, most newer 5ers are designed to be able to turn 88+ degrees without the slider. I've got several friends towing the same brand/same weight as mine with SRW short bed 3500s, a couple with sliders, several without & have had no issues to date.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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