I have a 98 Mountaineer with a V8 and All Wheel Drive, it's always in 4wd and is not towable with any wheels down and would require a flatbed if broken down. You need to find out exactly what transfer case you have. Some of the Ford automatic transfer cases can be put into "Tow Mode" but like Twinboat stated, it may require a software update in the 4x4 module.
Do you have a 2wd/4wd/auto selection button on the dash? That would point to having an automatic transfer case. Again, I have no selection so it's mechanically all wheel drive permanently.
2000 Fleetwood Southwind 32V - Ford F53 V10 6.8L