Thank you for the advice all! I think I should definitely contact ATC directly about the initial fitting question... Gotta get started in the right direction. So I am now looking at V6 SR5 Tundras. This is my only alternative to the Tacoma I would consider, and I'd rather compromise on that than the smaller camper.
Would the older SR5 Tundra work with the Ocelot model?
I have a 1st gen (2005) Doublecab Tundra with the 4.7L V8 and a 2020 ATC Ocelot camper. I would recommend that you go with the V8 over the V6. The 4.7L V8 engine has a reputation as one of the most reliable and longest lasting engines Toyota has ever produced. It is one of the best features of a 1st gen Tundra.
Why is the V6 SR5 Tundra the only one you will consider? What is your rationale?
The ATC Ocelot is great, I love mine.