New 2021 MGM Crewmax Sport Premium

Afternoon folks.
Looks like I'm taking delivery of one of the last 2021 Crewmax MGM Sport Premium Tundra's available in Western Canada...

Fai bit of research and reflecting on whether to go for tried and true VS the 2022 which I've heard may not be seen in Canada until late 2022 if we're lucky due to the supply chain issues.

Dealer allotments will likely absorbed by pre orders so good luck getting one unless your on a list and there's any inventory. Some of the largest Toyota truck movers in our Province already have a wait list larger than their yearly allotment for 2022 models.

Looking for a rig that will carry me until retirement and not cause as many issues as my first and last Ford 2017 F150 3.5 caused.

One item that many dealers are pushing is the rubberized Diamond Kote rust treatment.
Have used Fluid Film and other products on my vehicles and never had an issue. During extremely cold bouts which aren't typical I'll do a rinse down with salt away which has proven to really help control corrosion as well.

Does anyone have experience with the Diamond Kote and is it a benefit other than sound proofing that is a pita to wash down and could/or eventually cause more issues down the road.
I've seen the black style undercoating cause severe issues in the past and unsure if this product is snake oil as well.

They swear it helps with frame and body corrosion although most add on treatments are complete BS.

Thanks for the feedback