Originally Posted by Polk
I have a 2006 29bhs. The stock rims are rated for 1820lbs....snip
As mentioned, as long as the stock rim's maximum PSI rating supports the Maxxis "D" tire maximum PSI rating you should be fine with the "D" rated Maxxis.
As far as rim weight load rating (just for fun)............,
Your 2006 29BHS has a GVWR of 7,500lbs...., and 4 x 1,820lbs = 7,280lbs...., so the stock rim's weight rating is sufficient for the TT based on the fact the TT's tongue weight isn't supported by the TT's axles (rims/tires), your TV supports tongue weight.
Worst case scenario
, TT loaded @ GVWR: (7,500lbs) at (10% to 15% tongue weight) = 750lb to 1,125lb tongue weight range. So (7,500lb) - (750lb) = 6,750lbs weight on TT axles. (6,750lbs) divided by (4) = 1,688lb average rim load.
In most cases recommended loaded TT tongue weights are in the 13% to 15% range.
IMO going with the "D" rated tire will provide stronger side wall strength which is only one of it's advantages.