Leaving trailer hooked to truck

There's no reason at all to unplug. In fact, depending on the particular vehicle and wiring leaving it plugged in may allow the converter in your trailer to keep your vehicle battery charged. I never disconnect my plug.

With modern vehicles and systems, it is most likely not necessary, due to my excessive compulsive disorder, I all ways disconnect the cord form the trailer to the truck.

Johnnie

Unplug if you do not have shore power for the trailer. Otherwise it's fine to leave connected.

No reason to unplug. The converter can't do anything bad to the truck battery. If it could, it would have done it to your trailer battery a long time ago.

My 2010 F150 truck disconnects the BATTERY from the trailer connection when the truck ignition key is turned off...

No issue for me but I usually disconnect anyway. Would sure hate to wake up the next morning with the truck start battery run down.

Rule number one here is to never mess with the truck start battery - thats the only way to get home hehe...

Roy Ken

On my last drive to/from Alaska, I made a lot of one night stops in parking lots... I always left my Ram fully connected to the trailer. Set the parking brake so the transmission pin isn't taking all the abuse and call it good.

Even at some rustic campgrounds where there was no where to drive to, the truck and trailer stayed hooked for days.

Neither myself, my dog, my truck or trailer have caught on fire, suffered a dead battery or any other ill effects so far because of not un-hooking, nock on wook. ;)

All I can tell you is that when I leave the truck hooked for the night (and I do it often) I leave the cord hooked up. I've done it for years with a couple different trucks and have not had an issue. I don't start the truck with the cords connected, if that makes a difference. ( 59 is close enough to see it from there.)

Not necessary whether the truck has an isolator/relay/solenoid or not. Even without a disconnect, the worst that will happen is the RV converter charges the truck battery.

It depends on the truck but I always do even though I have a relay that makes it unnecessary. What I do not what to do is have both connected with the truck running. So just to make sure I unplug it.