Thinking about buying a 5.7 Dodge half ton truck.

Pretty good engine for sure, but let me ask you about the ecodiesel, is that an option? Not against gas trucks, trust me I own and like them. But with that weight either engine should drag that camper around with ease. BTW my Aunt has the 5.7 HEMI in her 2500HD and she likes it. Pulls 10K all around when she needs it. Don't mean to throw off the thread by posting another option, if you already thought of that, sorry just another option.