Insulation & Aluminum questions

Okay, so the camper is home! But before I put the walls back in on the inside (it's currently stripped out, except for the one white panel he'd gotten back in before he decided to sell it). I want to insulate it. What's the best thing to use? I'm going to be primarily camping in hot, not cold, but there will be SOME cold. What about condensation?
Foam seems like it'd be easiest to cut to exact dimensions. I hate working with the icky pink stuff. If there's a really GOOD reason to use that, I will suck it up and use it, though. (Or pay the neighbor to do it.
). What about using foam in combination with Reflectix or something?
Thanks y'all! Boss is going to help me troubleshoot my lights tomorrow!
Foam seems like it'd be easiest to cut to exact dimensions. I hate working with the icky pink stuff. If there's a really GOOD reason to use that, I will suck it up and use it, though. (Or pay the neighbor to do it.

Thanks y'all! Boss is going to help me troubleshoot my lights tomorrow!