Hi Kirk,I did quite a bit of study and research and I am very sure that the emblem on the front of your trailer is from Carriage RV which went out of business in 2012 and also that the one that you have may be a bit older than 1978. I did find a picture of a 1978 from the rear and note the similarity of tail lights to the one on the front of yours.
The only Heritage that I can find today is Heritage Glen by Forest River, a company that came into existence in 1996.
I very much agree with the others that what you have is a trailer that has been fastened into a fixed structure and that will never be a travel trailer again. You need to also check to see what the construction codes are in the county the property is in and if you need construction permits and inspections. This sounds like it will be quite a learning process.
Electric heat uses a lot of electricity. Quite likely yours is still supplied by the RV power cord and if that is the case you will be limited to a maximum of 30a for everything. A single electric heater on high will usually draw about 12a by it's self. A microwave will require about 8a or so. An electric cook stove can draw as much as 30a and usually needs 240V which you probably do not have. You need to have someone who knows basic electricity principles help you do any electrical work for reasons of safety.
It took me a while to respond because I did some more research about this type of trailer. How can you tell that it is a carriage RV because the photos I posted don’t have tail lights, do they?
I also found Heritage Glen by Forest River but like you said they are nowhere near that time. The daughter of the owner who passed away said they acquired the land in 1977 so maybe you are right and they did get the trailer in 1977 and not 1978 even though they had to wait a bit for the site to get ready. I wish I knew something about this Heritage, even see a picture of how it looked before. I find it so interesting to delve into these trailer histories!
As far as electricity goes, I do not know what amperage but I posted a photo of the meter on the site responding to Mark’s comment on my post. Each site has a separate meter and I will need to pay an electric bill to the utility. I do have a friend who is a licensed electrician so I could invite him camping and he might accept to take a look at it
As far as permitting I don’t plan on changing any of the mechanicals, just painting, floors and installing a basic kitchen (cabinet lower and upper, plug in burner maybe, sink without moving the plumbing and fridge). So not sure I would require a building permit for that. However, you are right, for the sale a fire Marshall has to come in and inspect as New Jersey or county law (not sure which law).
Thanks again for doing the research!