pressure all but one tire

I’m not familiar with super singles, but normally running a tire low will increase heat, and the chances of a blowout.Also makes a tire skip, on duals anyway, making flat spots. I’d keep at least 85-90 lbs. If it’s rated for 110 max.

 

Yup, blow out waiting to happen.
If it's a slow enough leak, you may get by with topping it up every few hours.
But an audible leak is an out of service problem.

 

Less than 50 % of max rating. Got shutdown once in Ohio for that. Legally flat OOS. Filled with air hose, off I went. I should have gotten a break that time. IMO.

 

putting more air in the other tyres just changes how much air you have in them three tires, It will do nothing for the fourth. Look at what youarev talking about and think about how that could never work.
You do not want to run a super single low either, it is nothing like running a dual low.
Is the tire leaking, coming apart or what. If it has been run low, be careful airing it back up, seen them blow the side out and anywhere close to it is not where you want to be.