Hi Tom,
I wondered if you got snow. We didn't. in fact we didn't get hardly any moisture with that last system. Just cold...
I think the orange trees will be fine. Those trees are at least 70-80 years old, and they've seen it all by now.
I was worried about my small meyers lemon and the new lime tree I put in this year, so I covered them with plastic sheet and put a drop light with a 25 watt bulb under each one.
The roid has Delo 15-40 in the crankcase, so it's probably not as bad as yours was with 30 weight. A few years ago I'm sure it wouldn't have been a problem for me to start it, but my back isn't so good anymore and it keeps me from putting as much "grunt" into it as I'd like.
I suppose some form of electric or air start is a good idea anyway in case something "bad" happens to me and the wife needs to start it...
I'll bet the supertrap looks pretty cute on your exhaust.
I've got the 5 gallon expansion chamber, followed by 10' of 2" pipe to get it under the corner of the shop and out the other side, then a regular car muffler on the end. It's very quiet with just a little "huff". The mechanical clatter totally overwhelms the exhaust sound.
630 hours? Wow, you're getting up there pretty good already!
I finally installed an hour meter on mine that powers up whenever the generator is making power. Less than $22 from Digikey
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=CRA219-ND