That’s great to know! Did your friend have to modify anything during the installation?
Yes, dcampbell. My friend did have to adjust some bed rails. It wasn’t too difficult though; just a couple of bolts and it was good to go!
If you can, I suggest getting a professional to install it. Sometimes, even small adjustments can create leaks later on.
I’ve heard that too! So, it’s definitely worth considering a pro for peace of mind.
That’s a solid point, wwaltersshane! A good shell is meant to be weatherproof. Any tips on avoiding common mistakes during installation?
Make sure you use the right type of sealant. I used a silicone-based one and it’s been perfect! No leaks!
Good to know! Was it easy to apply while everything was mounted?
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Yes! Just make sure to have a caulking gun handy. Applying it after mounting was not a problem, even for a newbie like me!
I had a bit of trouble fitting mine. Had to trim a couple of edges on the camper shell to make it fit snugly.
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Trimming? That’s a bit risky! Any advice on doing that safely?
Use a jigsaw, kelsey64! But always cut a little at a time. You can always take more off, but you can’t add it back!
And don’t forget to wear safety glasses! I’ve been there—sawdust in your eyes isn’t fun. 
LOL, exactly! I’m excited to install mine, but have a few concerns. How do I know if it’s properly sealed?
After installation, spray water over the edges while someone checks inside for leaks. That’s the best way to ensure a good seal!
That’s a smart tip! I appreciate all the advice. Can’t wait to add my camper shell!
Adding a camper shell to your GMC AT4 can really affect its aerodynamics. I’ve noticed a drop in fuel efficiency, especially at high speeds. It’s great for storage, though!
Really? I’ve found that my fuel efficiency stayed about the same. I think it depends on how heavy your gear is inside the shell.
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Be careful with towing capacity! I added a shell and my payload got tight. Check the AT4’s specs to avoid any issues.
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That’s a great tip! Overloading can really affect performance. Always weigh what you put in the shell.
I love my AT4 with a camper shell! It’s like a mini RV without losing the truck feel. What’s even better is the extra security for my gear.