I looked at this and other wheel well water tanks when building my water system, but none would have worked with my specific build. I have two pairs of L-track running front to rear, and we have captain's seats on Unwin lockers to facilitate easy reconfiguration (Transformer style). All of the common wheel well tanks run alongside the wheel well on the inner edge, which would interfere with the ability to place a seat alongside of it and severely limit our configurability. I'm sure our situation is a corner case, but something to keep in mind if it applies to your layout. Here are two versions that I found that don't run alongside the wheel well itself:
https://us-camperinteriors.glopalsto...rch-water-tank
https://us-camperinteriors.glopalsto...rch-water-tank
(Ultimately I built a frame to house 2x Sceptre 5gal tanks, which simplifies filling/winterizing and takes up less space, but that's not really applicable to the OP's post.)