OK, you really don't want to be pushing things like that. A dead lipo battery takes an hour to charge, assuming that your charger can do a 1C charge rate. The ice can do 8A up to I believe 4S, if you have a power supply that can deliver the current. That's why we all go with the largest battery pack that is practical. No matter what capacity you get, it takes an hour to charge.

You also don't want to be running a bigger battery than you need, because it will be unnecessary weight. I'll go out on a limb and say that a typical race setup in a truggy will get you about 30 minutes on an 8000mAh pack and a good 20 minutes on a 5000mAh pack.

If you get two or three 5000mAh packs, you should be good. I go with the 8000mAh packs because they are not too much heavier and are good for practice. It's also good to try to standardize on a battery pack so that the handling will be consistent. If you had two of these, you should be able to easily run the qualifiers and get in a bit of warming up and then use the other pack for the main. Check out the maxamps packs. They aren't the very best that you can get, but the service is good and the products are usually solid for the money. The 4S2P 8000mAh packs should be able to keep up with your current demands too. If you don't go with the 8000mAh pack, I'd get the 5000mAh packs.

I don't know about the mount. I just got my first one from Mike. All of my others were home made.