R, 105 96 bytes

Edit: -9 bytes thanks to pajonk

function(l,a=expand.grid(l,l,l),b=apply(a[rowSums(a)==max(l),],1,sort))b[,order(b[3,]-b[1,])[1]]

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R, 105 96 bytes

(or 89 bytes in R≥4.1 by using \ for function)

Edit: -9 bytes thanks to pajonk

function(l,a=expand.grid(l,l,l),b=apply(a[rowSums(a)==max(l),],1,sort))b[,order(b[3,]-b[1,])[1]]

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R, 105 bytes

function(l,a=expand.grid(rep(list(l),3)),b=apply(a[rowSums(a)==max(l),],1,sort))b[,order(b[3,]-b[1,])[1]]

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R, 105 96 bytes

Edit: -9 bytes thanks to pajonk

function(l,a=expand.grid(l,l,l),b=apply(a[rowSums(a)==max(l),],1,sort))b[,order(b[3,]-b[1,])[1]]

Try it online!