Everyone's opinion won't matter one bit as YOU'RE the ones that will have to live with the choices. Not anyone else.
Can you look at the fabric without thinking it's gonna boggle your brain and give you an intense headache looking at it? Do you like brown tones? If you can answer yes to both, then stick with what ETI offers.
If you answer no, then you need to pick something else out. You say you're on the road. Unless you're way out in the toolies somewhere, I'm sure Google can find ya a flooring and upholstery store in the nearest big town. Go in and see what they have on offer.
You won't need your upholstery delivered to you (or ETI) when you finalize your build sheet, but you will need to let them know what you've chosen. Most folks use Sunbrella fabric. Our local Calico Corners store had a huge sample book of that brand and made the decision making much easier. They even had a couch covered in Sunbrella so we were able to see what it felt like to sit on (I thought it would be a rougher finish than it actually was).
Same with the flooring. When you find what you like, contact Pioneer Building & Supply in Chilliwack to see if they carry the brand you want. They order tons of flooring for ETI and they'll know exactly how much you'll need for your trailer. We ordered and paid for our flooring months ahead of when the trailer was going into production. That way Pioneer had time to get it in from their supplier. They can also tell you if their supplier has it on hand - that way you won't have to worry that it'll be discontinued and you won't be able to get it.
For the countertop, you can go to the Formica website and see large images of what they have. ETI will only install the Formica brand, so don't waste your time looking at other brands. You'll need to tell ETI what you want when you finalize your build sheet and they'll order it from Pioneer. I found that the samples I got from Formica were pretty accurate to what I was seeing on my monitor. But, of course, your monitor/phone/whatever may show the colors differently than mine did. Hardware stores do have some samples on hand, but their website shows way more offerings than I found at Lowe's and Home Depot.
If you're happy with the flooring and/or the countertop choices that ETI offers, but not the fabric then just change that one item. You don't need to change all 3 of them. We did because we didn't like their choices one bit and we were willing to pay the extra money for what we liked far better. But, lots of folks are happy with ETI's choices (although I would love to know how many change just the upholstery! :whistling: ).