Anyone have experience with a REALLY GOOD AND COMFORTABLE tree stand seat for a LADDER PLATFORM? I have an old stand (aluminum) and I really like it....its been good to me....but the portable seats Iv'e been hanging tend to sag causing a very uncomfortable sitting spell...as you know when they sag, they tend to pitch you forward.....not comfortable....I would be using it for Bow Hunting. Would prefer a seat that has ARMS...is COMFORTABLE...and last but never least.....VERY SAFE. Would greatly appreciate your recommendations. PS: The platform is 20 X 30.