I'm toying with the idea of adding bead locks to my 12x16.5" wheels, but I want to know a little bit about their advantages. I know I'll be adding some width to the rim, my tires can handle that (44x18 TSL's) Will the single edged bead lock hold the tire on at 5-10 p.s.i. or can I run lower? Is the inside edge of my rim going to hold the tire well with low pressure or should I just start looking for a hummer wheel or those bladder type (tube style) bead locks? My spare tire is only 38" so if I were to lose a bead I'd be in a world of hurt until I got home. Should I just invest in a bigger spare tire?