I still say the gunslinger IMO is too slow for the lance,
marauder 4/6/0 2 ppc 1 large laser 2 medium laser
grasshopper 4/6/4
options
battlemaster 4/6/0 1x ppc, 4x medium laser, 1 srm6, and 2 mg (with 2 mediums rear)
banshee 4/6/0 1x gauss 2x erppc, srm6, 2 forward mediums 2 rear and 2 forward small lasers (replace with more gauss ammo)
zeus 4/6/0 erppc, er large laser, lrm 15, and 1 forward and rear mpl
gunslinger 3/5/2 2 gauss, 4 medium lasers front, 2 mpl rear
it doesn't sound that much slower but unless you are working your way across the river delta, or through a jungle/forest then the slinger will be faster but most of the time it has to run to keep up with the rest walking