Unless they've changed you should have 1 possibly 2 years bumper to bumper warranty from Keystone, how good that is depends on the diligence of your dealer as any warranty issue must go through a dealer.
Most of the appliances & other equipment is also warrantied from their manufacturers for longer than the rv manufacturer & some have great customer service.
As for your roof, the membrane is warrantied for 12 years as I recall, but poor/faulty installation is not, which the issue with most faulty roofs.
Also the original roof sealant warranty is for 90 days & must be inspected by owner or at owners expense every 90 days for any roof related warranty claims to be valid.
As I said unless something has changed no part of the original factory warranty is transferable beyond the original owner.
Danny & Linda
Former '13 FB owner