Tips on replacing rear air bags for more suitable rear suspension for tow vehicle

I have recently obtained a 07 Saab 9-7x w/ 5.3LH 325CI same as Trailblazer, as a new tow vehicle for my 3K LB boat.

I think the Saab has leaking air bags because when the car is turned off the vehical
Lowers way down haven’t observed how quick it lowers/when turned on the car raises to normal height, I’ve only driven it on the long driveway (car not yet registered) I don’t know much about this car other than it has a desirable Engine.

Please recommend a decent rear suspension upgrade for a mostly tow vehicle maybe inflatable air shocks? Or are replacement none leaking airbags be good enough to tow a 3K LB rig (3K weight includes trailer).

Additionally what is currently attached to the hitch receiver a shin protector?

Thanks for advice

 

anyone know about rear suspension?

 

I've never had air bags or even air shocks.

58 views and zero advice.

so I'll be going to junk yard for some regular trailblazer coil/springs and shocks. and remove the airbags I guess.

 

here's my brand new choice RA $154. + $15 ship total $169. hopefully monroe isn't a Chinese made parts for American co.

used 07+ tahoe Z71 springs could be used

anyone need a functional air compressor and leveler sensor.