Which would you suggest for a super ten?

I’m in the process of building a super ten dump truck. I’ll be working in the Southern California area. It’s gonna cost me 44k for the dump truck build and I have 3 used trucks im looking at and they’re all different specs, they’ll all be day cabs.

1.2015 Peterbilt 365 490k miles Cummins isx12 425hp,10 speed manual. $58,000

I’m thinking this would run me around 100k-110k total to build but it’s a smaller engine and if something does happen I’ll have to fix it sooner because of the mileage.

2. 2015 Peterbilt 367 330k miles Cummins ISX15
485hp, Eaton ultrashift, $85,000

I like this one overall for the mileage and price but I’m not too sure about the automatic transmission. It would total about 130-140k to build.

3. Freightliner 122SD 220k miles, DD15 505hp, 10 speed manual Eaton, 90k, with 1 year warranty

I was originally in the market only for Peterbilt and Kenworth trucks but ran across this one with low miles and a warranty, not sure if this SD model is more reliable than normal freightliners and also I’ve driven Cummins before so I’m familiar with those engines but not sure about the Detroit engines and also parts availability for these types of trucks.

Any advice is greatly appreciated, just want some feedback before I make this investment. Thank you all.