Looking to replace my 97 Ram 2500 4X4. I can't afford new or almost new so been looking at 2015 and down. I pull a 34ft horse trailer and an open car trailer. I hope to get a 28ft enclosed car trailer soon. So what I've been finding is most have the 5.7 but I found a few with the 6.4.The 6.4 is rated at 410 hp and 5.7 380. Is the extra HP worth it? If I find a 6.4 with higher miles vs 5.7 with less miles. I'm in Wisconsin so no mountains and very little highway mostly county roads. I've had the 97 for 18 years so this new one will probably be the last one I buy. Thanks Mike