New or Used. What say ya'll? I am looking to buy a 4 Dr. Truck for use for long trips towing my off road trailer, and would like for it to double as my Tow Rig for a single car hauler for my dedicated crawler.
Is this the only use you'll have for the truck? Also, how often (miles/yr and day/yr or days/month) and how far on average? How much do the trailers weigh?
If you're only going to use it a few times a year for heavy towing, the diesel may not be justifiable (especially buying it new). I know some think everyone should buy diesel 100% of the time (even for grocery getters), but they're not always worth it. They've made a lot of advancements lately and the gas engines are much more efficient, more powerful and more durable than they were ten or twenty years ago.
If you're only going to tow say 3000 miles a year, the 11mpg you get with the gas might be cheaper than the 15mpg or 16mpg you get with the diesel. [3000/11=272 ; 3000/15=200] Since gas and diesel prices are relatively the same right now, we'll use $2.50/gal as an average. That is bound to change though. So while you might save $180 a year [72*$2.5) towing with the diesel, don't forget about oil changes that'll cost you twice as much ($30 to $35 for gas [6qts of 5w30], $75 to $90 for diesel [12-15 qts of 15w40]) and the addition premium in the purchase price for the diesel option (new about $6000 to $8000; used about $5000). A new diesel truck would require between 33 and 44 years to break even in that scenario, while a used one would be 28 years.
If you're not going to use it constantly for towing, you most likely will be better off with a gas engine (even in a 3/4 ton.) Also remember that the max tow weight the manufacturer specifies is almost always more than you should tow. You still have to calculate in the stuff (including yourself) that'll be added or in the truck/trailer. A good rule of thumb is 70% for everyday tow use. If your truck is rated for 10K pounds, don't tow more than a 7K pound trailer.
If you're buying used, brand will also be a factor in price. On the diesel side if you want low miles and somewhat new, at a low price; you're going to be buying a Ford. For HD trucks (3/4 & 1 ton) Chevy/GMC their value the most, followed pretty closely by Dodge. Ford trails by a decent amount here. On the gas side Dodge is the cheapest, with Ford and Nissan in the Middle, and Chevy/GMC & Toyota being the most expensive. ((It sucks being a Chevy guy, since you have to settle for a 6 year old truck with 100+K for the same price of a 3 year old Ford with 1/2 that mileage. Guess it's good if you buy new.))