LMTV front tires loose air pressure - Trumpeter Models 135 M1078 LMTV Cargo Truck

depends on how often you check tire pressures. you could over time be loosing air by it leaking out around the tire bead, or the tires hitting a curb or pot hole that can cause air to leak, a dirty rim may need to be cleaned or someone is keeping the pressures the same that is noted on the decal on the drivers door jam. I trust you have used a good tire gage and not just looking at the tires, as there is more weight on the front tires than the rear and the front will look like they are lower in pressure.

Check air pressure in the tire first.
Check for worn tire tread pattern.
Check for loose neck bearings.
Check for loose spokes.
Chack front and rear wheel/tire alignment.

Your steering head bearings may be loose or worn out, your front tire may be cupped , and you probably are not running a high enough air pressure. Most likely the front tire pressure is just to low.