2" strap is somthing i have never used . I dont even know the rating on them . I can see your point about the stretch .
You mention jeep to jeep but often the larger rig will do the pulling so if some one with a full size is near by and he hooks onto the strap you could easily see a 16,000 lb force put on the strap . You mentioned 20,000 lb rating , thats new a used strap i think you would be really pushing the straps limits .
2" can be safe if it is inspected often and you dont let some one with a full size go nuts with it . I hate to call thinks close , im an over kill sort of guy :tonka: