I myself do not know on your 82 camper, but it has been a long time standing rule that appliances inside a living space be on low pressure (11" WC). I would really think this covers 1982, but I do not know the actual date it become law.
On the newer campers, the 2 stage regulator is an all in one unit that is part of an automatic switch over tank regulator for a 2 tank setup. There is not 2 separate regulators screwed together to create the 11" WC.
A prior owner may have goofed and put a standard hi pressure BBQ regulator on the camper main line.
Your concerns are valid. Pictures here can help so we can see what you are up against. Post a few pic's on what your main tank regulator looks like and a brand name to go with those part numbers.
Check the stove top inside the camper. Lift up the stove top and look at the gas label rating of the stove. The stove tops also have a 2nd regulator in them if you have an oven which drops the 11" WC down to 10" WC to be more stable. If your stove is made to run on 11"WC supply, the rest of the camper is too.
In case your suspicions are right and someone has the wrong regulator on the main supply, I would not use the LP on the camper until you sort this out.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club