Confusion over bed cover??

Hi,
First off, THANKS for any help provided.
Got a 2018 Tundra Platinum with the short cargo bed. I want to get a hard bed cover and found 1 that I like. But the product description has "For 2014-2021 Toyota Tundra 5.5' Bed w/Track System (incl Utility Track Bracket Kit) For models without the the Deckrail System"
Everywhere I have looked seems to indicate that track system and the deckrail system are the same thing? Being kind of simple minded, I thought that a deckrail would be mounted across the TOP of the 2 sides running down the length of the of the bed and the track system is BELOW. Mounted to the 3 sides of the bed box (front, and 2 sides) with the sliding cargo strap attaching points (which is what my truck currently has). Money is tight for me and I don't want to end up paying for a return shipment if the cover doesn't fit.
I'd appreciate any advice from all you knowledgeable folks.
Thanks again!

 

Can you call the manufacturer and confirm that it’ll fit yours ?

 

I don't think I can call and confirm. It appears that the product is sold in the US but the manufacturer is in China. Admittedly, I realize the cover I'm looking at is risking some reliability and possibly quality but the others I've looked at made in the US are at least 90% more in cost and I just don't have the funds.
Thanks for the thought though.

 

Well, I decided to bite the bullet and order the cover I was looking at with hopes that it would work and fit. It arrived yesterday and I put it on myself. Some of it could have been improved with a better design in my opinion but it did fit and I was able to mount it on the truck bed. It did come with these small brackets that slid in the existing original track rail system and was what was used as attaching points for the 4 corners of the cover. Still not sure what they were talking about with the "Deckrail System" but apparently my truck doesn't have it whatever it is.

Thanks again Lovetrucks for your advice and trying to help me.
May your wheels always be rolling!

 

These are the rails that they are referring to.