Welcome to the forum.
I see that so far, you've not received any recommendations from iRV2 members.
I've taken notes over the years when we were full-time on our experiences and those of other RVers we've talked to about service recommendations, etc. so have a notes for a lot of places around the country.
One place that was recommended to us when we were visiting the area years ago is Restless Wheels in Manassas. However, when I pull up their website, it appears to me that they may exclusively deal only with Blue Ox products when it comes to baseplates and tow bars. But I'm not sure of that, it just appears that way on their website and they are an authorized Blue Ox dealer. You may want to call them to see if they can get Demco products and install them (including AirForceOne ...but they are not listed on the Demco dealer list.
for the Demco (Air Force One) dealers in your area. The first dealers listed are big RV sales dealerships. I tend not to recommend them not only for service but specifically for installation of baseplates and toad set-up as they are usually much more expensive and sometimes difficult to schedule an appointment. The only one that I'm familiar with on the list is D&G Rv & Camper Repair in Carlisle PA. ----> go HERE
for their website. They have a good reputation in that area and can set up your toad with Demco products including AirForce One. However, they are probably a good 1 to 2 hours away from you?
So the only place I can recommend that might be closer to you for baseplate installation and toad set-up is Restless Wheels but I'm not sure how they'd handle your desire for Demco products. I'd call them and explain your desire for Demco and AirForce One and see what they recommend. They might ask you to purchase them yourself and bring it in to them for installation if they can't get them for a reasonable price themselves.
Restless Wheels -----> website HERE
8104 Centreville Rd.