Gary:
1 & 2. Then the vented compartment in the front with the hardware for securing something rectangular must have been for the battery or batteries. Which solves the "how the hell did they fit a generator in there?" question that I've been asking myself.
3. I see no obvious mechanism on the ball coupler, besides the, you know, ball coupler, so I'm gonna guess electric.
4. That makes sense, thanks. I should probably take the pipe out and close that off because I really, really do not trust any propane or LP system remaining. I'll stick with electric.
5. This one was full - literally full of junk from the impound yard. I mean a bench grinder? BMW parts? Bins full of broken hand tools? But we got it over Tehachapi pass and Hwy 17 and we've got the junk mostly emptied out now. The only four-digit number left on the illegible information plate says something like 3182 - I'm not going to go check it because I'm already exhausted and I have a lot to do today - but it was on the strength of that number, our weights, and the few possessions we don't have in storage adding up to less than 3500 and that this one looked least likely to disintegrate on the highway that sold us on this one, because the impound yard said that was the gross weight.
Rene: Already replaced one, will put the other three on the list right after "brakes".
SpencerPJ: Believe me, I know. At least when a high wind rolls us over, destroys our possessions, and kills us all I won't be wondering why. But most of our stuff is in storage and while I'm confident that the weight is under 3500 lbs (though not, you will note, so confident as to actually drag the thing to scales and check) I don't want to be Rromani-ing around the country towing it either. I just don't know what my choices are at this point. No, that's not entirely accurate. I do know what my choices are, and none of them are good ones.