I'm currently in the market for a 2021 1500 built to my spec. Here's what I see going on right now.
If you read the other RAM forum, you find a 500+ page thread on incredible deals people have reported ranging from 10-20% off of MSRP after incentives/rebates. I compiled a spreadsheet based upon deals being reported there for 2021 1500's and the average deal is around 14% off of MSRP after incentives/rebates. However, this is somewhat misleading and I'll explain why.
I took my build to all the RAM dealers within a 100-mile radius of where I live and started negotiating. I quickly found out that you can fairly easily get invoice price (or close to it) before incentives/rebates from many dealers, but anything lower than that and you'll need to fight like hell. The prices posted as "Invoice" on various sites like Edmunds appear to be genuine and it does appear to be the actual price that most dealers actually pay. However, the manufacturer then gives the dealer a "holdback" after a sale. For a $60K truck, this is around $1400 or so. So, many dealers are content to let you have the truck at invoice minus the mfgr incentives/rebates, which doesn't cost them anything, and then keep the $1,400 holdback as their profit. Plus, they can also make as much as several thousand on a trade-in if that's part of the deal. This keeps their business healthy. Some dealers may ask for a bit more than invoice giving them more profit or at least some room to negotiate down, while some others may give a bit off of invoice to be more competitive. But none want to give up much, if any, of their holdbacks.
So, for example, for my build with an MSRP of $61,850, the invoice was $57,025, and the price most dealers offered upfront with no negotiations. This is ~7.8% off of MSRP. Currently, there is around $2-2.5K in incentives/rebates depending upon where you live and what you qualify for. If you include that in this example, the price goes down to $55,025 with $2k in incentives/rebates. This is around 11% off of MSRP total and the price you can expect to pay before TTL and any dealer add-on fees.
So, figure around 11% or so off of MSRP after incentives/rebates as what you should generally expect. This is not great, but it's not too bad either. It's all a numbers game. After all, no one pays MSRP and you might feel great thinking you're getting an 11% discount, but in fact, this is actually the typical going price of the truck unless some dealer is trying to price gouge you.
So what about those incredible deals where people are reporting 14-20% off of MSRP? Well, those are real and there are a few ways you can do better than the standard 11%, but it's not always easy or practical.
The first is to find a high-volume dealer. They can sell trucks for thousands less. I imagine they can do this by getting better holdbacks or other such considerations from RAM for selling many more trucks than typical dealers. There's not a lot of them nationwide though, and if you're not lucky enough to live near one, you may need to travel many hundreds and sometimes over a thousand miles away to find one. Some buyers make a deal with them and then drive or fly down to pick up the truck. This is a good option if you don't mind buying remotely and traveling. Your local dealer will still service the truck, although you may lose any preferential treatment that they may offer to customers who purchase from them.
The second option is to try to hard negotiate with a local dealer for lower than the invoice price. This will eat into their holdback profit, which they abhor, and it'll be a tough battle. They'll often refuse to go any lower and give you the typical heave-ho, sending you away as a scare tactic. You'll then need to wait them out, but they'll usually contact you again to see if you're still interested. You may need to pit one local dealer against another or try to find a time when they're motivated enough to make a less profitable, a break-even, or a loss sale for some other reason such as during a slump or making their sales quota. This option is the most difficult, it requires a lot of work, good timing, good negotiation skills, a lot of patience, and some luck.
So, this is the situation as I see it. I hope this sheds some light on the purchasing process.