Yes, you can lock the slide outs when opened. Inside there are latches that you lock when the beds are pushed out. So from outside the camper you cannot push the beds back in. As far as gauges I'm not sure. My TM is an older one and doesn't have the "New Stuff" in it. But if you are camping at a campground you should use the direct water hookup and most campgrounds can refill your propane tanks when needed.
Hope this helps.
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