IMHO, if you are going full time and getting a 5th wheel I'd get a diesel. Our 5th wheel is a Laredo 265rl which is 30 ft overall and 10,600 lbs gross. We have a diesel 6.7 cummins and I am so glad. We previously had a gas truck and the diesel pulls the trailer soo much better. The fuel mileage doesn't drop off nearly as much when towing either. The only negative is the up front cost. As for fuel prices, you can never count on them being stable. They will always be changing good and bad.
I find my diesel costs a little less on fuel because even though diesel is more expensive I get better mpg especially when towing.
Good Luck and best wishes
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