Answering my own thread
I spoke to the very nice Forest River customer service person today. He said the frames of the Apex Nano 187RB, 189RBS, 191RBS all have the same frames, but where there is a slide the weight of the slide calls for a bigger capacity axle. This answers my question of can I put a bigger capacity axle on the 187RB and have the frame support the additional load. The answer is YES. He suggested a 4400# axle would be the next bigger one, but when I asked if a 4700# axle would be ok, he said yes. So folks, if anyone needs this information, here it is.
By the way, Dexter makes the 4400# axle, but TK makes the 4700#.
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