As a driver it will be hard to get your workouts in ,i mean will you do it early before work or after.I work in the hub so i get mine in before in the morning,i would be to worn out after to get a good workout in.but everbodys different,you should keep your carbs high if your worried about losing weight.I would use protein shakes during the day to help keep carbs and protein high,they are better than bars but bars are better than nothing.I personaly think that ups is counterproductive to bodybuilding but hey you gotta work right,the job has to much lifting your body never gets a chance to recover from your workouts.High carbs,high protein, 5 workouts a week max,and keep your cardio low or none if your worried about losing weight,good luck.