looks like the 28DS adds a side mount roof ladder, I'm new to this forum but have been shopping for the FR3 30DS for a while now. was at dealer and they had 2015.5 with all the new add ons but no Ladder on the Side. if you check the gallery on forest river you can see it also on some of the early units on sale RVtrader.
Just picked up our 2016 30DS yesterday. So far the MH is more than I had hoped for. There are no fans in the vents but they are pre-wired.
Love the heat pump, now if the spring would finally get here.
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Ed & Stephanie
SFC, USA (retired)