Here's my idea for you, get some kickpanel pods and throw some speakers in there (get components).
get a nice amp for them
just run 2 6-1/2" speakers and a sub, use amps (dont run off deck power)
dont bother with the rear panels unless u want to put your subs there.
if you get components in the front, and a decent 10" or 12" sub, it'll sound great, just send atleast 50w rms to each speaker (personally i prefer 100w or more, way better midrange)....
Dont need tons of speakers in a small truck, just a few good ones....

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim