Even a thin layer of truck bed liner is going to be as heavy or heavier than the carpet that was in there. Only, now your car will be ugly and loud on the inside.
The rest of the stuff (and it was posted a couple weeks ago, try a search) only weighs a very little bit.
I say just take the spare tire out and call it a day.
Just FYI incase you care, harnesses aren't safe in a rollover incase you have a roll bar because your body may not be able to move and your head will be crushed. But the chance of a rollover is pretty minimal on the street, so its up to you, just understand the risk.
I've heard people mention breakaway harnesses or soemthing but I'd never feel safe useing anything like that.
good luck with whatever you decide to do...
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