Glad it was helpful!
So here's more that I thought of after I posted the other one.. Also keep in mind, I'm new to this myself - these are just the things that I noted along the way on my first big trip - I'd love to hear improvements/corrections on what I learned or other ideas.
Bedroom: The bed has a vent above the bed, and the windows on both sides open. Makes for a very nice breeze. When we were on the ocean, it was nice to sleep to the crashing of the waves. Lots of fresh air with everything opened up.
Bumper: I'm sure most people know this, but just to say it - the bumper caps come off in the back, and it's the perfect place for a sewer hose. I'm also going to purchase a couple of metal bumper mount containers. There's a lot of storage on the outside of the trailer, but I'd like a box or 2 for the "dirty" stuff. Sprayer hose, power cord, welcome mats, etc.
Condensation: There was some when it got cold. Opening the bathroom fan on low, and cracking open the top vent at the front of the trailer helped a great deal.
Fridge: It takes quite a while to cool down. Bring ice. We brought a bunch of cheap little tupperware containers and filled them with ice from the cooler when we got there, then put them in the fridge with the food. Helped jumpstart things quite a bit - then we used the bowls for eating.
Kitchen Sink: Bought a britta kitchen faucet filter - worked great. It really needed to be cranked on there in order not to leak, though. And if I remember right, I think I had to mess with the gasket a bit. It was sort of clunky and in the way - ended up positioning the water filter portion behind where the water comes out (instead of to the side, if that makes sense) and it was a very good setup. The only issue is, with the pressure regulator and that faucet, the water comes out of the filter pretty slow. We used regular water for doing dishes, etc.. and for coffee/drinking/cooking, we'd flip on the filter.
Water tank: even if I don't plan on using it, I keep a little bit of water in the fresh tank. Never know when you might need it. For example, on our very first night with the camper, we took so long to get going that by the time we got to the state park the gate was closed. I won't even talk about the fun I had turning around.. but we ended up boondocking in a parking lot. Was very glad there was a bit of water left in the tank for toilet, etc.
Water pump: If you use the water pump, and don't have much water, be sure to listen to it to make sure it's not starting to push air. Can burn the pump out.
Oven: Sometimes takes a very long time to light the pilot. And if I didn't use it for a while, the gas would come out sort of stuttering.. even while it was doing that, I was able to light the thing and get the oven started. But it would take much longer than you'd expect for the pilot to stick. Great little oven though, and loved the range. Has my wife wanting to switch to gas at our house.
Oven + Kids: If you have little kids, the oven knobs pop off pretty easily. We just kept them in the top drawer till we used them. If only the gas water heat switch wasn't toddler-height...
Couch bed: The couches fold out into a bed just fine - but I think the cushions aren't the most comfortable. They are at first, but they sort of sink over time, and you can feel the wood pretty well below. I took a nap on it a couple of times, and used the pad from the top bunk on top of the couch which worked fine. If that's not an option, consider getting a pad for it.
Broom: Behind the living room couch is a great place to keep a broom
Outside shower: The thing works great.. Just wish it was on the other side of the trailer where the doors are, instead of right there with the sewer/electric/water hookups.
Camping without a sewer connection: The tanks fill up a lot faster than we thought they would. Make sure you're good and empty when you get there, and conserve, conserve, conserve right from the beginning. Having that water splitter at the spicket helped a lot. We'd use that hose for washing dishes, and use the outside shower for freshening up, brushing teeth, etc.
Wheel Chocks: Never have a moment where the trailer is not on your hitch that the wheels aren't chocked.
I almost learned this the hard way. You may not think you're on a hill, but your trailer may disagree. Chock before you detach from the truck, and only remove them when you're hitched up again. The first time I unhooked, the trailer rolled back a bit after it popped off the hitch. I about had a heart attack, and vowed to always follow the above rule.
Maintenance: The manual has a nice maintenance schedule in it - from "before every trip" to various regular intervals. I made photo copies of it so I could use it as a checklist. Also, just to pass this along - the dealer said not to use regular caulk on the roof. He told me what kind to use, but I didn't write it down. Point though is if you need to patch something up there, it's worth a call to the dealer to find out the best practice.
Slide out: common sense, but always double check to make sure nothing is in the path when going out and in. Also, never step on the slide out portion when it's slid in. In other words, do not walk on anything carpeted. It can crack the wood and break it. If you need to get something in there when the slide out is in, have one of your kids climb over the counter. Also, the dealer mentioned spraying the rubber seals with wd40 from time to time (both from the inside and outside) to keep the rubber healthy.
Tongue jack: Be careful of the emergency brake wire getting caught on the jack when you're lowering or raising it.
Leveling: I picked up a level. When I think it's close, I go inside and check on the kitchen counter, closest to the middle of the trailer. If you have trouble with it tipping too far to the slideout side, try leveling it with the slideout in. If you have trouble with it tipping to far toward the door side, try the opposite - leveling it with the slideout out.
Hooking up: Raise the scissor jacks before hooking up to the truck. Seems like common sense, but I was on a bit of a hill, and forgot to raise the back scissors.. the tongue jack lifted the trailer on to the back scissors, and put a lot of weight on them. I couldn't figure out why it was working so hard to lift the trailer on to the hitch. Just something to keep in mind. Also, as a lot of people have said, do two walkarounds before you leave. Maybe make a checklist. I've almost left things that the second walkaround caught. Also, once the lights are hooked up, turn on flashers and make sure everything flashes back there
Propane tanks: This is probably up to personal preference, but I only leave one on at a time. I'd like to know when I run out of the first and am now on the second tank. The exception of course is if it's cold outside.. don't want to run out in the middle of the night
But I'll turn the second one off in the morning.
AC - The fan on high is pretty loud. Low does a fine job, I think, unless it's really hot out, and is much quieter.
Extra Battery: I had bought a cheap 12 volt lawn and garden battery (for a riding mower I think.. 230 CCA or something) for $29 a while back for something unrelated. It's small, and pretty portable. So I decided to bring it along on this last trip, along with some jumper cables. Very glad I did - remember I mentioned that my fridge drained my battery when I left it on in storage? This little battery is what saved my butt. It was enough to power the slideout and the tongue jack so I was able to get things stowed away and hooked up. The dealer had told me that the trailer lights would power the tongue jack, but that was clearly not the case. Was very glad I took that battery. Anyway, for what it's worth. If you're dry camping, you might appreciate having the option. For $29, I mean, hey. It had more than enough power to do the job, and unhook on the other side. Also to mention, when I first plugged in after that, a breaker blew. I think it was the converter -vs- a dead battery. Even with the trailer plugged in, there was no power until I reset the breaker.
Fuses: Buy spares. I didn't blow any fuses - just breakers - but the trailer doesn't come with any spare fuses, so they're worth having around.
I think that pretty well covers it.. if you made it this far, congratulations - my fingers hurt
If I think of anything else, I'll post it.