i have 2 double axle trailers. both have spares.
i sometimes haul at less than max load, but more often than not, I'm hauling near max load. I'm also usually hauling in a location not near my house.
getting a flat 2m down the road from your house is one thing... getting a flat 2000 miles and 4 states away is another. especially if it's on a weekend/night/holiday... which just happens to be when I do most of my 'long' distance driving. IE.. take a red eye trip out ona weekend night bordering a holiday to run get a tractor and make it back before work the following day. would be a real buzzkill to have to stay on the side of the road till the NEXT DAY waiting for a tire place or tire service to open
can't afford to go down to one axle when trailer is at max legal weight on 2. .. just not safe for one, not good for the trailer 2. considering a spare CAN be had...
this 'not me' head in the sand syndrome is odd ???? I'm not pessimistic or anything.. but I figure that if it can go wrong.. it probably will.. and it may as likely be me as anyone else. Coming home from a fl to texas run in one of those trips i just mentioned ( started on a weekend night, thru a holiday.. etc ).. heading toward houston I ran over a black aligator... it ripped my trailer wire plug out of my socket, as soon as i noticed the 'ERR' on my brake controller I found a safe spot to pull over. Plug was ground down about 40%

Took some roadside emergency engineering, mechanics wire, and a roll of electrical tape and some zip ties to get brakes, and illumination and marker signals going again. could have been worse...
soundguy