You could rebuild the second Runner and sell it, or keep it as a daily driver and use your other as a dedicated trail truck only, rather than swapping over your engine/drivetrain. I eventually plan to have two trail rigs, one lightweight beater rig for hardcore rock trails like the Hammers, Rubicon and Fordyce(anymore), and my '90 for snow wheeling/camping, mild to hard trails, etc.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed