Thanks for all the replies, so far.
First, let me say, it's not a matter of not being able to pay for a catastrophic failure and I consider being able to do that and affording it, in two different categories.
Putting it mildly, I don't like parting with my money, but do like having some peace of mind and wouldn't even consider it, with a gas coach. Now, yes, buying a warranty is parting with your money and having to do so up front, in fact.
Doing certain work, is something I've always done and would rather do so, than have the hassle of a claim and having to drive it somewhere for a hopefully good experience.
As I said, I've always been against them, but in this instance, wanted some opinions, so keep them coming and especially with these company names, as I don't even know which one they will try selling me on, when we pick it up.
By the way, how many of you have had serious diesel engine problems and if so, CAT, CUMMING'S or other?