Well I am fresh from the scale 6020lbs. That is with no people, most camping gear, minimal food, and all tanks at around 1/2 capacity. My rig is a 1986 21' Toyota Sunrader Auto Trans.
LT195's are rated at 1900 load range D and 1500 in C.
Estimate of wight loaded, 7,000lbs/4 = 1750lbs per wheel wheel; I am assuming that if one tire on the dully blows she still needs to stand thus divide by 4.
So there you have it, I should get load range D, damn my vanity of not having an all terrain tire.