Why trailers almost always have auto inflate on tires, but trucks almost never do?

Trailers are the most neglected thing on the road, both in terms of driver and mechanical attention. Most drivers are in the same truck everyday.

 

On trailers its easier. As they are able to run the air line straight through the axle, and its not a drive axle.

 

A spray bottle with soapy water. Or remove assembly and put in a water tub

 

if you know it's 5-10 a week then WHY are you waiting to fill it 40 every 3 WEEKS....??

 

I carry a plug kit, they work pretty good to get me down the road.
Then when convenient I still get it fixed properly at a tire shop.

Trailer axles are hollow, easier to run the air lines. They do make ones for trucks, but they use lines that are suspended over the tires and drop down to the hub to feed the tires.

 

The units for the trucks are expensive and seal and o ring issues. They look hideous and to easy to break off.
I am glad I own my equipment.
Easier to just check my tires daily with a gauge when cold. All of 5 min or less
They make the halo system which bolts to axle flange.