Bed tent for 3rd gen

Im looking into getting a bed tent for my 3rd gen. Im 6'0 tall I think I could fit in one with the tailgate down. I would preffer something that if it drizzles it wont get into the sleeping area. I would also like a quick easy set up kind. If it comes with a little mattress type thing better, if not can you please recommend one? Also, are there any types of alarms or something like that that goes on the zipper? I wouldnt want some crazy person in the middle of the night to try and get in or something.

 

http://www.rightlinegear.com/truck-tent.html

CampGuard LED Lantern with Motion and Motion with Audible Audio Alarm Camping Lantern

https://www.amazon.com/CampGuard-Security-Lantern-Audible-Detection/dp/B01AYEJ23W