First: Most 4WD vehicles it is not recommended you dolly. Some 2018 JEEPS however it says you may dolly tow or trailer tow, or 4 wheel down tow (Which is how I tow my 2001 Dodge Neon FRONT WHEEL DRIVER Car
ALL WHEEL DRIVE (Full time 4wd) must be trailered however. no wheels down towing.
Now.. If you read the first paragraph you know I tow a Front Wheel Drive 4 down.
My First towed was also Front wheel drive towed 4 down
There are three ways to do this though I've never encountered the 4rd
On the 1992 Lumina APV there was decent ground clearance and I could easily reacy around behind the right front tire, So I had 'em install an AXLE LOCK (Remco Towing used to make them, Do not know if they still do or of they now just market them) This is a device that when "Unlocked" lets that wheel turn free, just like a rear wheel the differential spins but the transmission is in park so it does not turn.. Very nice.
On my 2001 Neon.. I don't have enough ground clearance so I use a LUBE PUMP, this circulates transmission fluid and keeps things lubricated and cool. it is powered by the motor home electrical (Chassis) system. and monitored to insure it is working. I tow in neutral.
Many Front Wheel (And rear) can be towed with the addition of one or the other or a drive shaft disconnect (For rear wheel drive) even though they are NOT designed for 4 down towing.
I have towed flat trailer, Dolly and 4 Down 4 dpwn is the way to go if you can.