Looks like 4-Runners have always come with at least 16" wheels. You will have to do something to make more clearance as 16" trailer tires come in 80 & 85 profiles and are quite tall. Unless this 4-Runner has some aftermarket 15" wheels, you are probably going to have to do a lot of work and end up with results you aren't happy with.
ONE TIME TANDEM AXLE PACKAGE DEAL
ONE PACKAGE AVAILABLE AT THIS PRICE
5 14X5.5 T06 WHEELS W/GUNMETAL INLAY
5 ST215/75R14 KENDA LOADSTAR KR03 RADIALS
STAINLESS CENTER CAPS, LIFETIME CHROME LUGS
MOUNTED, BALANCED & READY TO INSTALL
SNOWMOBILE TRAILER TIRES & WHEELS
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CARBURETOR REBUILDING - $125 + PARTS
LED lights, Chrome & Powder Coated Lugs