Always enjoyed my GX470 - almost 200k on clock when finally dumped. Would've kept longer were it not in need of new rear air suspension ($900 parts alone each side at the time). Oh and tagging 2 doe trying to "Evil Knievel" over the road hillside to hillside in front of me...
Anywho... might be possible... with second row seat backs folded down, third row seats on floor (seats make nice soft platform), with top turned perpendicular and loaded upside-down at angle (plus a number of Harbor Freight moving blankets) it might work but will be snug sneaking top in the rear gate
Here are all dimensions on GX470:
https://www.driverside.com/specs/lexus-gx_470-2004-4214-9097-0
Agree though, safest way would be to either drive Box, install there and drive home or rent truck w a 6.5'+ bed.
Good luck
