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Both fan belts on my car get a bit tighter when the engine gets hot because the entire engine expands, so the distance between the pulleys increases a little bit.
I doubt it's a fan belt. They make screeching noises when they slip anyway.
Are your rear tires rubbing anywhere in your fenders? You said you had more weight in the back.
Maybe something is touching or dripping on your exhaust system or heat exchangers and it smells like burning rubber.
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