Being overweight is never a concern Joe. I was just curious, because your bed appear to be by far the heaviest I have ever seen.
FYI, I did weigh one conversions exactly like yours. As I recall, (not sure) it weighed 15,600. I can't locate that weigh slip, but seems like about 5,100 on the rear axle. Don't know how much fuel was on it at the factory, but that number seems heavy. No RVer will ever approach GVWR or GCVWR when RVing. When registered as a motorhome, you won't be stopping at any scales anyway.
onezman
http://onezman.tripod.com/onezmans.conversions