Here's a link to The Expedition Portal Trailer forum
that I've been getting amazing help from. You can most likely get wheel adapters, though I'm not familiar with the ZJ, so I can't be certain. These
are the least expensive ones I've found to go from the 5 on 5.5 pattern of the trailer to 5 on 4.5 of my TJ.
'99 TJ Sport, 4.0 I6, 5 speed manual transmission, Hi Lift w/offroad kit, Viair 450C compressor, Garmin GPS, Skid Row Engine/Transmission, steering box & radiator skid plates, Kilby gas tank plate, AtoZ Fab full length rocker guards, Performance Accessories 1" Body Lift, OME 2.5" HD springs & shocks, JKS trackbars front & rear, BFG AT 33x12.5r15, EBC Yellow pads and Centric rotors