Would a JBL 10 inch 300 RMS car subwoofer be a very good and loud bass for the trunk...

You have money to burn. That speaker is dead. It just hasn't yet been cranked up by the amp you have , which is too strong for it. Then the dying process will be completed. Your speaker should have a higher power rating than the amp. You may be mindful of not putting the volume at its upper limit, but passengers may get passionate and do it-

blammo, poof, sorry I messed up your ****speaker
dude, next time spend more of your money.

Less amp or more speaker, and nobody but you can touch the volume.
 
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