Our prior RV was an ACE 29.2 which is smaller than your 29M and I easily fit four 100W Renogy panels and controller. I believe your battery compartment is also the same size (two 12V batteries share space with hydro pump?) and I first just change the 12V's for 2 golf cart batteries (wired in series) and then later reconfiged the relays in the bay so I could fit four 6V batteries.
I'm not saying you need the same, just what worked nice for me.
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2018 Palazzo 33.2
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