The only one I can recomend is the Forest River second year for $250.00. Dealers have a tendency not to bring it up but for $250 Forrest River will take your 1yr to a 2yr warranty. Nothing to do with the dealer, you will need to fill out the paper and send the check into FR.
As for the other warranties, lot of people say they are not worth it. I bought one for my first camper and never used it, always fixed it myself. Your roof and most things of concern have longer warnty anyway.
2015 Sandpiper 30IOK
2014 Ram 6.7 CC DRW
2006 Charger RT