[Doc]

The majority of the weight is in the front regardless of what's in the back seat or not. I had my car corner balanced and even with the weight reductions I've done the front corners were still carrying 1,000 lbs each. If half the weight of the car shifts forward under a hard panic stop then the fronts are trying to handle 1,500 lbs or more so I wouldn't go below 1,800 lb load rating for the fronts. Stock I think the load rating is 105 which means they're designed to handle just over 2,000 lbs so I wouldn't go below a 101 which can handle just over 1,800 lbs.

Think safety first; when in doubt, lean towards the safety side.

As a general rule it's best to not mix tire brands or even tire models from the same manufacturer. Each tire 'model' has a certain designed behavior so for the best results you want that same behavior on all 4 wheels. This includes grip, dry and wet performance, sidewall behavior, rolling resistance, etc. If the front and rear tires are behaving differently that's the kind of thing even a trained and skilled driver doesn't like. For the average street driver? It's just asking for trouble in my opinion.