does anyone own (or picked up) a PB from carvin? my pb200 will be here next friday or so, and i need to know if i'll have to get some casters when i go to lowes today. -are these amps balanced enough? does 50 lbs feel like 50 lbs? because i'm involved in so many music programs at school, i walk pretty close to 1/2+ mile each day carrying an amp. i need to know if i'll be ok without casters.