Front receiver hitch

We had a custom receiver made by a qualified welding shop that was recommended to me.

I suspect you're going to have to have a custom receiver fabricated for that RV. I assume you have a specific reason you don't want it at the rear?

I too would recommend a local shop and caution about air flow.

Now I use a "DROP" adapter to tow my car. Used to have a "Dual" adapter (but it turns out to have too much drop) You could go with a "Drop/Rise" You might have to have it custom made but with this type of adapter you have two receivers on teh rear. one for the tow bar (Bottom) and one for the scooter (Top) Which is how I carried Wife's scooter by the way. And there is one more option as well.

But I've not yet eliminated all the variables on that one.

I had a local fabrication shop weld one on for me, it was no big deal

Be careful when blocking air flow to the engine/radiator.

Without a large enough market, custom is your only option.

I did but they only have universal fit and from what I see there would be no way to clear the crossmember between the frame rails. Looks as if I may be looking at a home made custom piece.

I would try giving etrailer a call. They usually got that stuff.