This works well at recreating the OBS style GM trucks. My 5th model. This was a truck I owned and customized many years ago. So, most of my photos were of a 1993 full size short bed single cab Sierra specifically. I trained this one on approximately 60 photos. 

These are my current test settings that provide a pretty accurate result:

Strength.7

CFG: 3.5 

Steps: 35
Sampler: DDIM Trailing

Size: 1:1 1280x1280

Trigger: Trux-OBS

If you want faster results you can bring steps down to about 20 and use the Flux ‘Dev to Schnell’ lora but it tends to make newer body-style versions for some reason.

Example:

My first few test images from my 5th epoch looked a bit odd. They looked like industrial work trucks and lifted versions. Once I began testing it locally, my results all looked really good. Sometimes it will make a newer make/model version.

Example prompt:

trux_obs lowered gmc sierra truck saratoga77 extreme details. A beautiful metallic black OBS Lowered truck is sitting outside on a rainy day in Dallas Texas. Sideview of the car. The ground is wet, reflecting the car in the wetness. The vehicle has been lowered. It is low to the ground. The car is the focus. Beautiful sun background. Golden hour. The full car is visible. silver wheels