OK. Wow. That model fridge is 21 kg. That reassures me, as our trailer behaves the same. Thanks. Also, I figure when the box in front is loaded, moving the tire back would distribute the weight better and take some off the tongue. Anyway, still thinking about it ... :-)

That would be perfect for our camper if not for the larger tires. If you are interested, give me a shout at tdnudds@gmail.com and I'll share a sketch of what we've drawn up to mount a spare on the side. Would either of you suppose there would be any reason to be concerned about the behaviour of the trailer while towing?

Thanks for the quick reply. Yeah, that was the first advice I got. I checked out Princess Auto. Can't find anything that gives me enough clearance, either in-line or perpendicular to the tongue. Should have mentioned that the tires are 26" in diameter. And we have the large box too, flush to the front wall. Definitely not room to mount in-line on the opposite side than the hitch jack, and there is no more room to slide the hitch jack forward in the travelling position. There is also not room to mount the spare perpendicular to the tongue between the box and the hitch jack and still have clearance for turning the hitch jack handle. Not to mention that the tire is taller than the lid on the large box, and would be somewhat in the way up against it, which I could live with if I could still turn the jack handle.