I saw your post come through in last week's 5th Wheel Forums newsletter. Seems no replies means no one here has used them. I did find this site:
https://www.sitejabber.com/reviews/camperpartsworld.com
... with 1500+ reviews, at a score of 4.56 out of 5. That *seems* to indicate good things, however, reviews can change over time. I recommend reading the most current to see how they stand currently. Unfortunately, with all things "online", there *is* some risk. I'm sure I'm not telling you anything you likely don't already know.
Depending on what you're looking to order, paying a few more dollars for a purchase off Amazon, where you can likely be assured of decent service, might mitigate any risk you're concerned about. Sometimes, I just like to go to a local hardware store or RV parts store (no idea what you're looking to order) to ensure I'm getting what I hope to receive.