I struggled quite a bit on the timing decision for my 2500 purchase... in part due to when to roll the dice on placing the order relative to expected delivery timeframe & historical norms of meaningful FCA rebates/incentives. The reality I came to accept was that significant incentives (at least my perception of 'significant') on the 2500's just don't materialize as they do several times per year in the half-ton market. That said, I lucked out a bit with FCA's current 0% financing incentive which was valuable to me for my situation.
Nobody particularly loves paying interest on depreciating assets to begin with, but the 0% offer allowed me to be comfortable paying up for some FCA add-ons at the time of purchase (Maxcare, couple others) & let FCA eat the net present value penalty for them. Without the 0% offer, I would not have purchased any add-ons. At most I would have reevaluated doing Maxcare via Zeigler (or the like) down the road just before the eligibility cutoff. When FCA pushed out the 0% financing back in January, I thought for sure I would miss it... but I was excited when they extended it this month.
Granted, for cash buyers.... 0% offers are annoying & often counterproductive since they typically suppress incentives that bring down the vehicle cost. Good luck, hope they offer something that helps you in your timeframe!