Suspension Life? Shocks and Springs will vary.
With 82k on those shocks, i will bet you would be amazed at what a new set will feel like. Don't care how it was driven.
New shocks will also make older springs feel newer, but will defintely show some wear under load, like with a trailer on back. I generally don't let shocks or struts get past 75k. Springs are more tolerable.
'99 SR5 Sport - Desert Dune: AirRaid MIT, OEM Air Filter, Toyo 265/75/16 ATs, Deckplate, PP Springs and Bilsteins, Cheapo nerf bars, Injector replacement impending