electric/brake connector too loose

We picked up our new Hood River 177 Friday. On the way home the electrical connection shook loose, meaning we had no lights or brakes. The dealer said it is the connector they always use, a Husky, and if it is pushed in all the way it won't come loose. We have made sure the plug is all the way in, but even jiggling the heavy cord a bit, like on a bumpy road, the top flap that is supposed to hold the plug in place, wiggles up and the plug slips enough to lose the connection. The prongs on the plug and receptacle seem too short to hold with any amount of bumping. Has anyone else had this problem?
Thanks!

Our electrical set up has a "Husky" receptacle on the van and a Bargman plug on the trailer. Neither side has a pin or hole, just a short tab on each that are supposed to keep the plug from sliding out. The cord and plug are quite heavy, so any bumping, like our California highways, causes the tabs to slip apart and the plug slides part way out.  Seems ridiculous to have to tape a brand new electrical connection together every time we use it!

   cgarb, try pushing the plug into the receptacle and wiggle it a little as you push. It could be that the prongs in the receptacle are tight being that it is new and not allowing the pins on the plug to seat all the way in. As you push the plug in look at the locking tab on the receptacle flap and make sure that it sits all the way down. Don't be afraid to push the plug in hard. If you believe that the plug is going all the way in and is seated, you can use a plastic straw to get a depth measurement of the receptacle then lay it on the plug and make a mark to see if it seats all the way.

I have found that the OEM 7-pin Bargman socket on the rear of my new Chevy Pickup has a slightly larger diameter than on my other vehicles.  So when I plug in my Pod's plug, the plug does not fit tightly but can wobble somewhat even when the locking flaps are correctly matched.  So the lighting circuits don't always light up. I ended up carefully 'expanding' the individual metal tabs inside the plugs to make at least a tighter contact even if the two plugs don't fit very tightly.
The Pod's socket plug fits perfectly on my other tow vehicle, so it is not the Pod plug's fault.

Is your TV a newer GM product?  I am wondering if GM's chinese parts manufacturer has used
a metric-SAE conversion measurement which is an approximation of the SAE diameter of the Pod Plug.  I have found a lot of imported SAE wrenches are actually a metric approximation of the stamped size.