While I’m not opposed to a chassis swap, I believe the 4Runner is going to be a lot shorter than an AD truck. A google search shows a 4Runner having a 109 wheelbase. A 3100 truck is 116 and 3600 125.5. As far as width goes, I don’t know, The 4Runner being based on the Tacoma, it should be ok.
Yeah, I found out it would be waaay too much work.
Thanks and Merry Christmas!