You have a new MH, buying now, from the dealer is not prudent IMO. I would wait until the factory warranty is about to expire and buy independently from the dealer. This give you at least a year to shop for the best deal.
Read any extended service contract closely-every word. An exclusionary contract (it is not a warranty) specifies what is NOT covered, by omission everything else is covered. This is easier to absorb and understand what you are buying than an included contract which states what IS covered, by omission anything not mentioned is not covered. I don't know every part of an RV, so would not know if I'm spending my money wisely.
I would recommend buying the "seals and gaskets" rider, whichever company you decide upon, otherwise if an engine or transmission seal blows and the oil leaks out while driving, you are NOT covered for any damage resulting from the leakage.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"