A manual transmission PT Cruiser is towable four down. You can get a lube pump from REMCO that, when installed properly, will allow you to tow your auto tranny PT four down (I have one on mine that I am not using, I should remove it and get rid of it. I don't even know if it works.) How are your straps getting "chewed up"? I towed my PT from here to Chattanooga and back last year, with no strap damage at all. No problems of any kind, in fact.
As stated, MOST (but not all) 4X4 Jeeps are towable four down. Two wheel drive Jeeps are usually not towable four down unless the driveshaft is removed.
Subarus are towable four down, but MANUAL TRANSMISSION models only. SOME All Wheel Drive vehicles are NOT four down towable.
Many other 4X4 vehicles are towable IF there is a NEUTRAL position in the transfer case. Automatic or manual tranny makes no difference.
ALWAYS read the "Recreational Towing" section of the Owners Manual when considering a vehicle.
Good luck in your search.