Another tip-Get to the station early. They generally just trickle board, rather than one mad rush 10 minutes to departure, and you can go to the platform anytime in FTW. I recommend the right hand side of the train, the sun will be on the left going North, however the best scenery, is on the left going North- there is a fairly scenic part of the route along the Washita river.
Also, as this train turns daily, half the seats face forward, the other half backward. Best chance for 2 together, on a more than half full train, is in a backwards seat, as most people generally prefer to ride forward. I have used a 17" laptop on this train many times, no issues. There is no wifi, and even cell service is spotty in the rural areas, for about half the trip. And maybe an hour out of the 4, with no cell service at all, something to keep in mind. Some days are busier than others. I've been on sold out trains between OKC and FTW, and I've been on it once, when I was one of just 4 or so people going north. Had almost a whole car to myself.....As with all things Amtrak, it all just depends.....But as others have said, no tables, except the few days a year they put a full sightseer lounge car on, for the annual OU/Texas game train.