[Verse]
Grandpa's Mack had a heart so wide,
Rumbling down those plains with pride.
Western Oklahoma's dusty hue,
Four years old, the world was new.
[Verse 2]
The chrome gleamed bright, the tires sang low,
Through red dirt roads where the wheat fields grow.
His calloused hand on the wheel so strong,
I felt safe where I belonged.
[Chorus]
Bigheart Mack, rolling down the line,
Carrying dreams and a heart so kind.
The engine roared, but his laugh was sweet,
Every mile felt like a heartbeat.
[Verse 3]
He'd hum a tune 'bout a cowboy's way,
With the Oklahoma sun melting the day.
The air smelled of diesel and fresh-cut hay,
I wish I could go back and stay.
[Bridge]
The highway stretched like a melody,
Boundless as his love for me.
In that cab, I found my start,
A little boy with a big, full heart.
[Chorus]
Bigheart Mack, rolling down the line,
Carrying dreams and a heart so kind.
The engine roared, but his laugh was sweet,
Every mile felt like a heartbeat.