As long as you don't run the batteries down too far you should be ok. I'd be testing them with a meter from time-to-time or keeping a close eye on your control panel to monitor their level of charge.
If they start to get too low for comfort, you can hook your RV up to your truck and put some charge back into them and when you are ready to put your slides back in, do the same thing -- hook up the truck to the RV and run the truck engine. I do this all the time when retracting or extending both the slide and the front landing jacks on our 5th wheel.
If you are going to be doing a lot of dry camping, I'd switch all of my incandescent overhead interior lights to LED's. You'll be surprised how much less of the drain on your batteries you will experience with LED's.
You might also want to look into solar for keeping your batteries up or take along a small, portable generator - say 2000W - for topping them up and for other low amp/watt draw items as well.
After 3-4 days of prudent use of your lights, water pump, etc. you might still be "on the edge" - if you don't have any means of keeping them charged.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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