These two (emphasis added) points make me think "remote box launchers". With Striker could you construct a what is basically a cube on a cargo pallet stuffed with vertical launch cells that could fire individual or salvos of missiles?
Striker offers four ways to launch a missile: a package (what the troops use), a rail on the outside of a vehicle, a launch tube (think of a thin-wall cannon that you stick missiles in instead of artillery shells), and a magazine launcher (basically a launch tube with a magazine). The latter two can be "field-mounted" - roughly the equivalent of putting a couple wheels on the thing so you can tow it around. Or, in the case of something small, maybe a tripod or baseplate or something so you can set it up where you want it. Field mounts aren't light: four times the mass of the missile launched, plus of course the launcher guidance systems, if needed. However, having a vehicle transport them in and setting them isn't terribly time consuming if you're trying to hurry together a prepared defense.
Here's my concern: the enemy kills it by dropping artillery on the area. Put a lot of tubes on one field mount design, and a lot of tubes die when the artillery falls and they roll a frag hit. You want individual field-mounted tubes, not cubes of several, to increase the survival of the launchers when the artillery hits. There are also guidance types that aren't really practical - if you've got 8 operator guided missiles in a box, you still need 8 operators; that's not an issue for target-designated, homing or target memory, of course.
You could conceivably design a kind of armored "vehicle" that consisted of little more than the launcher(s) and a suspension inside an armored shell, the "vehicle" towed in or placed by another vehicle. You save a bit by going to a vehicle-mount tube rather than a field-mount tube, then spend that and more putting armor around and a suspension under it. It amounts to a home-made field mount, with the benefit of a bit of armor protection. However, the heavier the armor, the fewer the transport can carry and the greater the cost and the gnashing of teeth if it takes a direct hit or you're obliged to leave it behind, so it's worth a close look to decide if it's worth it or not. More naked missiles might be a better option, even if you lose more to artillery.
The nice thing about the set-up is - with target designated, homing, and target memory missiles - you can have one man launch a lotta missiles, assuming he's close enough to control them. That means you've gotta have a radio or laser link. Radio can be jammed, a point of vulnerability. In the case of laser, it gets tricky since he properly needs a laser comm of his own for each missile if he intends to launch them all at once. That need also imposes problems - he needs to have a clear line of sight to each launcher, so brush and stuff needs to be cut out of the way, which in some terrain might give the game away. Maser comm? Would that penetrate brush? Maybe, though there's still a bit of set-up involved in establishing a control point with several maser comms. You could use wire, doing something akin to the field telephone set-up, but wire can be cut by artillery.
Re Ladar. From MT on they fixed ladar so that it became only a secondary system for maintaining a lockon rather than a wide-angle search system. But, in CT/Striker it is the system of choice for stellar tech military vehicles under the rules-as-written. Especially TL13+.
The other interesting point is that in TNE/FF&S they introduced a rule that turreted vehicles (i.e. grav tanks) could not slew their turrets at high speed. So, essentially that limited the utility of the high speed pass, which in CT/Striker a grav tank can do while slewing its turret to engage a target well off the forward arc. As written, in CT/Striker there is little point in having Speeders or grav fighters when you can have a grav tank zipping around like a fighter and turning its big main turret to engage in any direction while in free-flight.
MT introduced the "EMS Array" combos at TL10, folding all the detection systems into one package. Also introduced EMS jammers, doing the same with counter-detection. I don't recall if the jammer could be used to contest the lock on as well as the initial location attempt, but it definitely put an end to the supremacy of ladar. That TNE thing, I'm not sure I like it all that much: with inertia damping technology and computers and such, moving the turret around quickly doesn't seem like a terribly daunting feat of engineering.