My advice would be:
- consider what having to get a 7-year loan means - to me it would mean I can't really afford this truck
- if you want to buy anyway, arrive at dealer with alternate financing as a plan B. In the US, that would be your bank or a Credit Union - Canada I don't know
- do not negotiate based on monthly payment, but on cost of vehicle and warranty. From your post I can't tell how much the dealer wants for the warranty.
- for the warranty, also arrive with plan B in your back pocket. Find an online warranty company and see what the going rates are in Canada. As a reference, on my Limited, my dealer wanted $2000 more than what I had priced out online. They make serious money on the warranty if you just pay what they charge because it's rolled into the financing.
- finally - you may have your heart set on this truck, especially in today's crazy market. Ignore that as much as you can and be prepared to just walk away.
Not sure what the OP's credit rating is but that may be why they're looking at used instead of new. From the bit of information the OP shared, I would be walking away because it doesn't look like a good deal but right now it is definitely a sellers market. Hopefully the OP can get his deposit back.
Financing in Canada is definitely different than the US. For new car, most of the financing goes through one of the Big 5 banks, even the 0% offers. Unless you have a good credit rating, you can pretty much forget financing through the banks. For used you start to see financing options from 3rd parties but those come with higher rates. What most people may not know is the dealer does get a fee from the bank for sending the loan their way. A good negotiator can use this reduce the price a bit.
As for the warranty, if it's the Mopar warranty it'll be the $0 deductible version. You can negotiate it as well. When I checked what the equivalent warranty to what I purchased would be in the US through Ziegler, what I paid was actually better. Up here dealers won't sell the Mopar extended warranty online so everyone is on their own. Lord knows I tried to get a few to bite but the minute they realized I was only interested in the warranty, they weren't interested anymore. I have a feeling that what the warranty the dealer is including is a 3rd party one though.
OP, if the dealer isn't willing to send you an itemized quote of the deal for you to review, you have good reason to be suspicious. Good luck.