Need Suggestion On A $250 Removable, Clean & Hard Hitting Bas

[M500]

Any one has any good suggestion on a budget $250~ $300 removable, Clean & Hard hitting bass? I need my truck space for weekend grocery shoppings and as Airport shuttle for frequent family visitors, so removability on a dime its my number 1 concern. I also pertty picky about my bass, well not as picky as before but I don't want to spend too much right now as I'm still shopping for another car perhaps a Honda Oddyssey for my weekend duties. Thanks.