A 42' FB trawler is probably just a bit too big for one tarp. Trying to fit multiple tarps is always a challenge. $1K seems to be in the ball park, but you might want to shop around just to be sure.
I'll be tarping again this season. My primary reason is to avoid damage from an overly rushed shrink-wrap crew. Every year I've had it done, anywhere, it's the same story. The weather is bad. They're way behind. There are two snowfalls before they get to my boat. They walk all over my decks and white vinyl seats with muddy boots. They secure the frame to the radome, or to some other fragile part. They always break something. They don't leave room for me to move around or access things inside.
The last straw came when the 1x3 pine ridge pole they were using for the frame broke, and the snow collapsed my entire Bimini. I'd asked them to either take it down, or let me know when they were going to wrap it and I'd take it down. But they were in too much of a rush.
Tarping isn't easy. You have to get the slope right for shedding snow. You have to keep it 100% tight so the wind can't lift a corner and take it away. You have to make sure you don't leave any section that can collect rain water and make a "pool" which will pull the whole tarp in. But to me, it's better than the alternative.