This was not a stupid guy. I would bet he had a super IQ and thought this all out. People are acting like what he did was impossible.
First, he must have checked the place out. He had several days to do the load in of equipment. All he had to do was check in and have maybe one or two bags. Nothing suspicious. Then later, maybe when a lot of people are checking in or out, he slowly brings everything up one or two at a time.
Or get one of those big garment carts and take up several things in suit cases or athletic duffel bags. Long objects are just stood up in a reinforced garment bag.
In case they have very aggressive bellboys, most places have several doors on the sides and back for people parking in the back. Often, you can come in without even passing the desk. Walk it up one floor and then hop the elevator.
Hotel people generally aren't looking at what you bring in after you check in.
A high school kid could figure this out.
How do it know all of this? Experience. Nothing illegal.
This is where the Phoenix sheriff who is making these public statements comes across as less than impressive.
1. I don't think the guy needed a super IQ to plan or execute any of this.
2. I sure don't think he did something all that difficult at all. Once you make up your mind that you're going to kill a lot of people at one time and you're willing to die in the process, the planning isn't all that hard.
3. If the report I read yesterday is true and Paddock actually intended to escape, then you can knock about 50 IQ points off your "super IQ" assessment of him because he sure didn't plan or execute that part very well at all. In fact, that comes across as someone who is either not very bright or is completely delusional.