I don't think the 'lemon law' applies to RV's, but it could be a 'state' thing too??
Also, isn't the definition of 'lemon' where the same repair has been done a number of times and there seems to be no lasting 'fix' for it?
If you are having many different things go wrong and they are repaired, but don't repeat with the same exact repair again, I don't think that's a 'lemon' as such.... Just a poor job of QC or a POS trailer to begin with... ;)
My trailer had some 'minor' things pop up on it, and I took it back to the dealer initially, but got tired of that as they were things I could just fix myself and do a better job of it!!
Now, if an appliance went bad during it's warranty period, I would have brought it in... But, I fixed most of my fit and finish stuff with a screwdriver and some additional screws in most cases...
I know it must suck to have issues with a brand new rig, but sometimes the cure (taking it back to the dealer each time) is worse than the original problem (fixing it with a screw driver).
Good luck!
Mitch