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The basics of a solar charging system are panels -> charge controller -> batteries. You want to make efforts to minimize the wire distance between the charge controller and batteries, as well as use adequate wire gauge, in order to minimize voltage loss due wire resistance. I don't know what the "solar prep" feature entails, but wahoonc's post describes a plug in port that likely ties into the camper's existing 12V wiring from the main power center to the battery/batteries. In my head, this describes a portable panel system that is only deployed and hooked up when you are setup for camping. You will require a solar charge controller between the panels and the plug in port, but suffer from voltage loss along the long wire path from the port to the batteries. That can be compensated for if you use a charge controller with adjustable charge parameters or voltage sense lines separate from the charge path, but charge controllers with these features are usually intended for setups with more wattage than OP is describing (i.e. more expensive but offer more capacity and features). It sounds like it could be a useful bit of pre-wiring, but I prefer my solar setup to be permanently attached to the batteries so that it is charging and maintaining them every day all day when exposed to sun. This means during camping, travel, and storage, rather than only when you have deployed your panels and hooked them up to the port.
gjwinner850's post and link suggest that the solar prep port is limited to 10A and fused at 7A. This means that any solar input greater than roughly 7A * 12V = 84 watts will exceed that rating. Now the reality of solar harvest is that you are only going to achieve a panel's max watt rating under ideal circumstances for a short window of time during a day, so your proposed 200 watts of panels may not pop that fuse or otherwise exceed that rating. But they have the capacity to and I wouldn't be OK with that setup myself. Maybe you can just increase that fuse size if it is easily done? Based on this rating, I'd say this solar prep feature is aimed at attaching a small solar panel for maintaining an already fully charged battery/batteries during storage. If OP wants a solar charging setup with a goal of having meaningful recharging capability, then don't bother with the pre-wired feature and do your own install from start to finish with at least 200 watts of solar panels. Rule of thumb is 100 watts of solar per battery, but with small systems you should plan on a bit more wattage than that since you'll be more dependent on a daily harvest to get through the next night.
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2012 Aspen Trail 2710BH | 470 watts of solar on the roof | 2x6V GC batteries | 1500 watt PSW inverter | Micro Air on A/C | so far strictly boondocking
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