A man and his truck.....

More details -
Mileage if HYW does not matter
Pure city
Country roads
what is the 300,000 comprised of .

Next does the old truck need fixing now , or is it the future .
Get the new or newer truck .
then hunt for insurance companies that will give you the best price for 2
I've seen it for me , one company to expensive and another priced rite .
Having 2 trucks is the way to go , one for more easy going scrap projects & used to get new jobs ( looking more successful ) & the other for use that you just don't worry if a big pipe hits it wile you load. Dividing up the use with 2 is a good thing . Finally in time the old one will pass on . Then you have your new truck that has been babied for a few years ready for full action .

If the old truck runs don't get rid of it .If major work is needed to continue thats different . As to Dodges lasting , yes absolutely , still a factor I believe is many of us take for granted our driving stile causes most any vehicle will last if you use care.
Driving technique transcends to any vehicle you have . Well driven & maintained Motors / Trans will last .
But the truck may look like a beast .

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Final factor - as long as you have a decent family car and the wife is happy with her ride
then whats the rush if your truck is doing it's job . Lets face it a scrap truck is a work truck
being gun shy when loading - stepping on roof with abandon to get a better grip . tossing off heavy item's off the side with no care is a priceless feature .