The 8 ply nylon 700/15s took about 4 ounces each to balance.
I bought a set of 235/75R15 General car tires " the cheapest in that size that Sams had" back in 93 and put them on our 66 24 ft Airstream. Pulled that old trailer on many trips up to the Dakotas, Montana, Idaho , Colorado,Wyoming Etc. on those cheap tires, "they were about 35 bucks a pop. back then" and had no problems whatsoever with them . Put a set of 700/15s on it about 2001 and never a flat or anything . The 66 25 ft is heavier than the 05 Safari we use now and the 700/15s
will be a huge improvement from the 215/75/14 GYMs that came on it .