Maybe you need more screws and washers closer together? Add a screw/washer to some of the cross-members in the middle?
Don't be to down, this is a learning curve for owners of new RV's and what we need to do as owners. There are just some things we will need to take care of ourselves to be happy.
I am not trying to disappoint you right off the get-go. Try not to get to hung up on the warranty and get the big things fixed.
You can always go to Goshen and they will fix lots of little things for you while you camp and have a good time!!
Hope things go well for you.
BTW I went through all of this and have learned that just like my house, there will be things to fix all of the time. I find fixing some of them while camping is fun! JMO!