HELP! First Time buyer getting cold feet.

I should have been slightly more specific. I apologize for being unclear, although your responses were still more learning for me. I was referring specifically to these tripod-looking supports that go directly under the 5th wheel hitch connector box to stabilize the extreme front end of the unit where the bed room (in our case) is located. I didn't know if there was an issue with the actual extra weight of having two people moving around and sleeping up there when the truck wasn't attached. I an see where there would be less "rocking" or side-to-side movement (perhaps) if one was installed, but how do you feel about the actual "need" in the absence of having the truck hooked-up?

Thanks for the input on the slide-outs too! I would still love to hear additional comments about these two issues, just wanted to make my first post a little more clear. I look forward to anything additional.

Have a great day!