no problems with mine so far. haven't paid much attention to fuel mileage but it does handle nice. i too am planning on beefing up the rear of mine to handle the weight(starting to get the saggy butt syndrome). which isn't uncommon. but so far, i'm lovin it!!!

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SAS88TOY, caged, lockered, Longfielded, etc. etc. etc. blah blah blah!!!
2005 Tundra Quadcab.