Are you set on a 2 Wheel drive and not a 4WD truck? I'm not sure why you would want to go into a flat tow situation knowing you have to use a disconnect. I'm not sure there is enough body of evidence to give you advice which 2WD drive trucks to avoid, reality is that problems happen hard to say if its the owner or truck. If the truck is designed to flat tow it should be fine.
A couple place to start:
Motorhome Magazine Dinghy Towing ListRemco Towing Store can tell you in more detail what can be towed 4-day, which need disconnects or which are not recommended.
Once you narrow your truck make, model and year its easier for some other owners to chime in.
