I have a trailready prerunner bumper on my 03 Yukon. looks good, but is very heavy (I had to install a levelling kit to get it to ride properly and stop sitting on the bump stops all the time). they seem to have a good selection of bumpers for this era of gm vehicle.
just to clarify. the cone lugnuts (used factory with oe steel wheels) will work with any generic winter steel wheel or oe steel wheel. the style with the flange/washer for factory aluminium wheels will not work.
any tire store/dealer/etc should be able to get you a suitable lugnut
for studded tires I'd recommend nokian (either the hakkapelitta 8 or LT2 depending on size/ply rating). note that these are dedicated winter tires, not for summer use. Yes they are very expensive (usually a little more than Michelin) but they are THE best tires available for on road winter use
its actually the truck getting reprogrammed, not the sensors. each sensor has a unique id code, the truck has to be told which codes to look for. also, if your truck has the factory tpms reset button under the dash, do not push this after changing sensors until the truck has had the new sensors...
I have a plate bumper on my truck (03 gmc Yukon), from my experience with that, be prepared to upgrade suspension at the same time as the bumper is installed. I didn't, and the front suspension drooped enough that it was riding on the bumpstops, which split in half. I put in a cheap leveling kit...
I have nitto terra grapplers on my truck. not to loud on the highway (mild hum, nothing excessive). I haven't tested them much offroad, but ive read a lot of good things about them online. and there road manners are good.