Is it dumb to consider 1 tons and 40s if I want to retain stock gas tank?

My question would be why on earth would you want 40 inch tires? What are your plans for the jeep? Usually old retired people pull them behind motorhomes

Some of us know to put them on a trailer. While I'm not on 40's I'm close. OOOPS and I'm only a 3/4 ton build not tons..
 
My question would be why on earth would you want 40 inch tires?
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Jeep lifted vs stock.jpg