$60,000 buys 20,000 gallons at $3.00 and that gets you 160,000 miles at 8mpg.....now lets talk about the lost earnings on that $60,000 over 10 years....maybe 20 years....or more....not even cost effective....do you work for the government?Unless you are adamant about doing it with Diesel...you could do a conversion for $60K in about three months.
Happy to elaborate on how this is done. An outfit called "Electric Yacht" (right in your back yard) can help with the design. Let's talk...I've been involved with a number of hybrid designs for boats, I'd LOVE to tackle an RV conversion!