making money with one is possible, i made good money for many years, part time and full time i estimate 25 years, with half of that in my personal rig, up until the economy went south. about the same time, business at the pit i hauled out of went down hill,the main town in the area was built out to its limits, in 2000 when i arived at the pit at 7'am, there were from 5 to 12 trucks lined up waiting on a load, this year they are lucky to see one truck in a week, there just isnt anywhere to go now, i sold my truck as the insurance is a killer, mantenence is as expensive as a otr rig if not more so, tires on a dump truck dont make it as long, usually its something like a piece of rebar run through it, my break even point was running 4 days a week and thats at least 8 to 10 hours a day, more than that was a profit, work varies by region,and depending on the local economy, and how much development is happening in your area [ here "your area" is a 100 mile radious] and me, being you, i would do some scouting before you buy a truck, talk to people, make real sure you will have work for it if you do buy one. nothing worse than paying 650.oo a month for insurance, 1500.00 a week for fuel, only to see your truck sitting in the drive doing nothing, if you find work, and this means regular work thats going to last at least long enough to recover the cost of the truck, do it, if theres any question dont, unless you have the money to support a money pit thats doing nothing
prepare to drive all day, then fix the truck all night, so you can work it the next day, half the time thats how things are,if you commit your truck to a large scale job if your supposed to be on the job at a certain time, that truck better be there, no matter what, if you loose your place on the haul due to break down, a few times nobody big will hire the truck, your'll be doing 1 and 2 load private jobs and you cant pay for the operation of the truck like that