Buy chairs rated for the real weights of your group. We bought higher weight rated chairs 4 years ago,and they had held up well. The WalMart "guest" chairs have all died.
Also, consider the heights of the chairs. At 6'7", I have my "big chair" that is very comfortable. Wife has chair that she fits in well. We spend time outside when RVing.
2020 RAM 3500 Tradesman HO Diesel, CC, LB, 4x4, DRW
2008 WolfPack 295WP 33ft 5ver toyhauler (first large RV)