Bigger trailer, bigger truck.
Though "technically " you'd be within the legal limits, your travel joy will be increased with a bigger, heavier truck.
Dragging 7k up a mountain pass, one time, in your Colorado would likely tell the story. And, hopefully, a great brake controller coming down.
Casita typically have a heavier tongue weight, but not as heavy as an O2.
Your Colorado would likely be fine for my elite 1, but towing a 2, other than on flats and gradual ascents/descents, I'd want some more oomph, and vehicle weight.
I know it's hard to think about trading up trailers, and vehicles at the same time. My 2005 Silverado is about the same size as a current Colorado, but heavier (6k). I have a similar tow rating. Id personally only tow a 2 in Florida flats. Id be nervous going our route to NC, at highway speed, and up green mountain gorge, with your TV.
Your anxiety will be decreased, and travel joy and cargo capacity, will increase with a bigger vehicle.