I'm 170# and don't carry a passenger.
The suspension gets a workout off-road with loaded panniers and top box, but I found it had enough adjustment to make it function well enough. It's on the soft side but I just crank up the preload a bunch on the rear shock and add some compression dampening on the forks when loaded.
Unloaded with rider only, it works fine for me at close to stock settings on and off-road.
I think at your weight, you may be pleasantly surprised.
I'd spend the money on a seat upgrade before suspension, but that's me.