Ordered from Mark Dodge in March and locked in 0% up to 72 months. Took delivery the first day of June, $62,000 on a $76,000 truck, 0% for 60 months or just at $1000 a month.
I'd recommend anyone to join PenFed. Get the rebate via TruCar (backed by PenFed) and you'll win out by having access to some really good interest rates without a lot of shopping. Max out those rebates if you can...join Tread Lightly, PenFed, etc (how to get the best price thread is your friend).
I purchased no GAP, protection plans, tire coverage, extended warranty or anything else. I drive less than most people (except summer) so I'll stay way under depreciation. Carvana already offered me $64,000 for the truck and I owe $59 now. I keep a close eye on depreciation and will do my best to stay ahead of it.
Last big purchase I'll add is $2400 for the 8 year/125K mile warranty via Ziegler / Mopar. I don't think I've had a loan with interest except my mortgage.
Also, unsolicited advice but December is usually employee pricing for all so I'd recommend people put in a 2022 order in September or October and lock in any rebates at the time then hope for insane dealer promos in December.