Astroturf?
Wrong sport, dude.
Seriously - go with the bedliner for the entire floorpan. I did mine in Herculiner several years ago (four, maybe?) and it's still in awesome shape. The fumes are done after a couple of weeks and the fears of outgassing when it gets hot are waaay overblown.
Line-X rocks hard. That's what I have in the bed of my truck and it's tough as hell. The do-it-yourself Herculiner is Much more affordable for a trail vehicle, however. Have you priced what it would cost to have the inside of your rig sprayed? The labor to tape everything off is a killer and COSTS. Whereas if you do the Herculiner yourself, you can take your time applying it with a bruch and roller and not have to mask the whole thing.
Good luck.