Thickness of the Pod's walls

The rack is two pounds. It will be mounted right onto the wall itself on the slide out portion by the sink. It has four places to attach it to the wall so just want to use the most durable fastener for something of that weight. 

I'm looking to add a fairly weighty rack to the wall on our slide. It has four places for it to be mounted to the wall. It looks like I can go safely in about an inch but do you all suggest regular drywall mounts?? An adhesive to hold them in before we put the screws in??

Yes, I used locktight caulk in the holes I drilled for the plastic expander sleeves.  The paper towel rack seems to be holding up well.  The problem arose when I pulled the pod over several miles of the worse possible backroad (more of a trail) into the Big Belt Mountains here in Montana.  It shook loose most of the 3M adhesive hooks on which I was hanging a lot of stuff.  So, better to secure the "hanging stuff" with something more substantial.  Again, thanks for all the advice.

 Usually use 3/8 - 1/2 inch pan head sheet metal screws on the inside to hang lightweight things or those that rest on a surface but are fixed to a wall. 3/4" or Less plastic inserts will work too. On the exterior I use very short Molly's or plastic anchors but first fill the hole with silicone and wipe the excess.  So far all have held with out a problem- remember that very little we carry or hang weighs over 3-4 pounds.

Boy, a picture and a measure.  That is service.  Thank you so much.  It looks as if I am going to have to go with 7/8" screws or smaller.  1" may be a little too long.