I usually don't respond to these gas vs diesel discussion's. But I feel several key thoughts have not been discussed for the OP to make an informed decision. You said in your OP most trips will be 5-7 hrs away and you would tow a Jeep. Not mentioned is what size MH do you want. Do you want a short MH to get into SP cg's, do you want a longer MH to live in or extended trips out west? This does not fit your OP of 5-7 hrs away from TN. To me if you want a small MH(24-32ft) look at Gas, 37-45 ft look at DP's, in between the decision is harder. Not mentioned is the performance of Gas MH's vs diesel MH's, a 30ft gas MH will have 362 HP and weight 15k lbs a 40 ft DP might have 380-400 hp and weight twice that. The 30 ft gas will have in general better performance not because the gas eng is better but because of the huge weight difference of the DP. Remember as the DP becomes shorter the HP is decreased. A 38 ft gas MH will have the same 362 HP but much heavier weight to pull, much less performance but 5-7 hrs from TN would still work towing your Jeep. Read the sticky from Johnny T about Gas vs Diesel for a better understanding and good luck on you search.