I think you need to ask yourself how do you plan to use the MH first before you get to the gas vs diesel question. Do you plan on staying in FHU RV parks or more remote CG's with no facilities like NP's, SP's or NFS CG's. Will you move often to see the country or stay in one spot for a month. How much storage do you need for the stuff you want to take with you. How much water do you need based on where you want to camp. Then determine what size your want based on your use. If you want a large 36-42 ft MH a DP would be a better choice. If you want a shorter 28-34 ft MH for travel look for a newer gas MH because you won't find many DP's in that size anyways. Everyone has a different camping style so their choices may be good for them but not for you.