Trixx, I don't mean to be that guy.... but ..... did you have get a different lift on your Tremor to run 37s or do they just fit with stock Tremor lift?
I personally love the power you get from the diesels and their range especially because aux tanks and after market high capacity replacement tanks are possible. I have a Duramax for towing a horse trailer and love it. I'm just inclined to go with the 7.3 for this flatbed camper build as I won't be towing with it. I am also hoping to use it for international travel where 87 octane will be more prevalent and ULSD may not be available at all. I have found the Def and Fuel Filter and emissions sensors to be a PITA when we have taken it for longer trips, so I'm thinking the 7.3 should be more than capable but just hoping to find ways to extend its range.
Depends what you do for wheels and tires. If you do 18” wheels with a +18 offset they’ll likely just barely rub the radius arms at full lock. If you do 17” wheels at +0 offset (what I have) on stock suspension, they’ll take a little trimming of the front inner fender. It’s easily driveable as it sits now, but I have a Carli Backcountry leveling kit coming which will eliminate any rubbing. Many people drive with way way worse running like this permanently, but I’m not OK with it. For a couple months that’s fine, but I don’t want a vehicle that rubs, period. FYI - these are all 37x12.5’s.
If where you’re going you’ve researched that ULSD isn’t available at all (mind you, with a 60 gal S&B tank you could safely have 800-1000 lies of range) then you need to go the 7.3, period. I would not get the diesel expecting the areas to eventually change.
Lots of 7.3 owners are very happy with their trucks. Mind you, they just came out in the 2020 models, the 6.7 has been out since 2011, and revised around 3-4 times since then.
In your case, I don’t see the 6.7 even being an option without the availability of fuel where you want to go. I do see a lot of comments in this thread that are somehow stating the 7.3 is comparable or better in anything other than cost, which I don’t agree with in most all cases. Yes, the 7.3 can do a lot of the same as the 6.7, but not nearly as effortlessly. The hauling, towing, daily driving, fuel range, fuel mileage, etc. are all leaps and bounds better on the 6.7.
The 6.7 is more complex, but my last 6.7 was bulletproof. In 75k miles I think I only had 1 exhaust sensor fixed, other than that, not a single problem. I had a hot shot guy with a F350 6.7 tow my 42’ 5th wheel for 1000 miles and his truck had 350k-400k miles with very minimal issues.