LOL! same thing happens with me every time. not a huge fan of the 20's but the sound system must sound great and help keep the back end in check. i've driven many 4 litre cherokees and they are REALLY tail happy so the added weight of the speaker boxes must help alot.
drive safe buddy.
As much as the added weight helps, it also bites harder that way... way too hard.. I've tried that Its really easy to control without any weight, but with something heavy in the back, it either does not do anything and go like a peaceful car or bites so hard that is uncontrollable or un-catchable