Looking at buying a 10' 3500 slt it's a pretty basic options truck. It only has power windows door locks and mirrors I'm wanting to add keyless entry and remote start but using OEM stuff so is this possible. Also it has a painted bumper w/o fog lights and I'm gonna swap bumpers to chrom with fog lights. Is there a harness factory installed to power up the lights if I add factory switch and what brackets will be needed to mount lights? What's the largest tire I can fit on it with out using spacers on the rear