If you can spend a little more, consider getting a decent fishing bedchair, preferably a good make like Nash or Trakker. Thousands of fishermen use them every night. They are built to last, and you can pay as much as you can afford really, from £40-£300, and although you get what you pay for, even the more basic models are tough, comfortable, very well made. More expensive models are usually lighter and stronger, with more padding, or might be wider or longer for different shape/size people. My mid-range JRC bedchair cost around £80 about 10 years ago and is still going strong. The nearest current model is something like this
There are loads of sites out there selling them, but this is a decent starting point.