truckin'

due to my current financial status,im forced to back to OTR(over the road) driving. My question is,can anyone give me some advice on staying in shape and even gaining,with the f#$ked up schedule ill have.Ill be driving 10 hrs a day,sleeping in a noisy truckstop,and eating whatever food i can bring with me.I cant store too much equipment,so besides pushups,situps,and lunges does anyone have any advice?? any would be greatly appreciated. thanks