[480sparky]

Go to an RV/Camper stupply store and ask for a 'dogbone'.

It will look something like this:

They will only work if you have 4 wires in the 220v receptacle. Just make sure you know what type of 220 receptacle you have to plug into, so you can make sure you get the right kind of male cord end to match it.

Since you now have a 110v receptacle, you'll need to GFI-protect it with a GFI cord.

 

[480sparky]

480 this "dog bone " is for converting 30 amp 120 to 15 amp 120 travel trailer service it will not work for 240 volt 30 or 50 amp but i'am sure you already know this

I could only find a photo of a TTL-30 to NEMA 5-15. That's why I stated to make sure the receptacle is a 4-wire (120/240) and not a 3-wire (240 only).

But I've seen dogbones that plug into 14-30 and 14-50s that will convert down to a 5-15.

 

[480sparky]

Dunno about y'all, but the last 47 times I built a temp pole, the neutral and ground were bonded in the box, and run to
a rod set with the pole.

At the first point of disconnect is the only time the ground and neutrals are to be tied together. After that, they are to be kept separate.

I see no harm in using an adapter .........

I do. At least some of them.