I have a 2012 Chevrolet Express G3500 Duramax diesel van. It has a Quigley 4×4 conversion and I am using a Blue Ox tow bar. I would like to safely tow it behind my Prevost Liberty coach. Are there any fuses to pull, or do I just put the transmission and transfer case in neutral and leave the key in the on position? When I did this it became very erratic in the way it towed and did not track straight.
Louis Leonor | Via email
This may be a big problem. Since these were not originally a 4×4, they were not factory approved for towing and there is no instruction for doing so. Normally the transmission on an approved 4×4 is left in park and the transfer case in neutral, with the front hubs freewheeling. The steering geometry of the front axle determines much of how it tracks.
You need to contact Quigley and ask for recommendations for towing, fuse removal, etc. You might also have an alignment specialist look at it. It may need more caster to track properly. Some shops familiar with 4×4 vehicle dinghy towing also dial in a bit more toe-in than recommended for a vehicle that’s not dinghy towed, as this can also help towing stability.
— Ken Freund