If you're fairly handy in that you could fix the plumbing, do some light electrical and build a shed around your home I would pass on the warranty.
Google and Youtube are exc as well as a forum like this or the brand forum for your model are exc places to get help. RV's are not near as daunting as one would think.
I would look for a 2 year old trailer if possible. 1st they should be way less than even a newer discounted one and 2nd most of the bugs should've been worked out. Lots of people buy one then want something bigger or want a different layout and trade up.
If you're not at all handy then either buy new and get an extended warranty or buy used and get a warranty. If you have deep pockets then don't get the warranty.
I would also add that there's plenty of RV's that don't have problems worth taking to a dealer. Having owned 3 different trailers from 3 different MFG's I would not get an extended warranty. I'm also pretty handy. If you like to tinker on stuff then most problems are easily fixed. Some yearly maintenance is also required. Like caulking or bearing repack. RV's need to be stayed on top of and not neglected. Too many problems occur from owners that don't know about the maintenance requirements and let things get out of hand then complain that the MFG made junk.