I wouldn’t buy a camper trailer without first seeing what I was getting. Plus, if there is a showroom and a shop, you’re more likely to get something repaired than with a company merely unpacking boxes from a container.
Is there a phone number you can ring to talk to someone about the product? I’m always surprised how many people are willing to buy a camper from eBay without ever talking to the seller. When something does go wrong, emails are easy to ignore.
And what many of these sellers do is delay delivery of the product beyond eBay’s feedback window of 90 days.