What you need is a SAR Quad Battlemech, with 3 slots of emergency equipment divided between the Head and Center torso. Call it the St Bernard 
Get on that, IW! (Would that be a BattleMech or an IndyMech? I know BT has at least one emergency rescue Mech.)
Oops! 
Grimdark SAID it was sorry!
They could slow boat into each other.
That's basically how Grimmy made it to Toreel, at least.
She said it was okay.
That was quick! (I half expected a "no". Not sure if she'd be mad at me or something.)
That'd be cool. It'd give extra tonnage to something else. Those tripods are net and would make for good minimech carriers.
At least one of my WotT Tripods did that, I think. (Although, in their case, they were bona fide battlesuited troops.)
I can see passenger areas in Mechs. I can even see quarters being installed in Mechs. If the Marco Exploration Mech can have a fold out two person cabin why wouldn't a Uni Cargo Mech be converted into an RV? I don't think many such mechs would still exist though with everything being converted to a war use. It might be nice to have rules for that as a last remaining example or to play around before the Syberians were killed and left.
I'd leave that to you guys, or a random bunch of "pre-holocaust" Syberian machines that didn't survive to modern times, but were built to ferry humans and such. Some might be commercial/industrial precursors to the AutoMechs of today, even.
Does anyone remember the movie Robot Wars? https://en.wikipedia.org/wiki/Robot_Wars_(film) The Scorpion Mech carried passengers on tours. There could be SafariMechs carrying passengers with portals/windows though their faux flesh, to study all the native flora and fauna.
Probably something the AxiMaL and PresiDom factions might have had, maybe.
I forget where, but there was also a rule about extra crew/passengers weighing .5 tons each. Between single seat, dual seat and 10 for a infantry compartment there could be different passenger classes. Actually, you can have 13 passenger seats (75kg each) per ton. They're not carrying gear so you can get more people in, maybe. The princess might have brought her matched luggage with industrial sized hairdryer. 
Dunno where that might have been in canon rules.
Yeah. Although when converted to vehicle mode, it'd be easier for infantry to load and deploy without boarding ramps, ladders, or ziplines.
Right. My thinking is that it would be just like how the Transformers handled things, where they arrive on the scene in vehicle mode, wait for the fleshlings to get out, and go robot mode only then. (As opposed to the one or two GoBots eps where they could hold humans inside them the whole time.
That'd be a fun Mech for XTRO:Boondoggles; The Clan Edition!
The early Fire Moth could be included too for carrying infantry in arm pods.
Someone else would likely want to tackle that one. (I *did* think it could get the multi-volume treatment of the Primitives XTRs, but then I lost any say in the matter.) Honestly, after writing, editing, illustrating, and laying out an ENTIRE 220-page TRO more or less solo--credit where it's due to those of you who assisted with your own designs, minis, and various forms of input--I'm kinda burned out on TROs for the time being.
I don't know that you'd be canonizing the Sandman LAM but the door to Mechs carrying infantry was opened with Clan LAMs carrying a passenger. That was followed by TRO:3050U's fluff for the Fire Moth and then your Tripods in War of the Tripods carrying battle armor. I don't think Syberian AutoMechs carrying passengers would cause a problem. Besides, there is the Illegal Quirk. 
Understand that I'm not canonizing anything. I'm just seeing what WAS canon, which the Sandman apparently wasn't. War of the Tripods was also considered non-canon (Halloween Gag), even though it was meant to be canon-compatible, like so many of my fun projects.
[SPECIAL REMINDER TO ALL: Aside from Necromo Nightmare, XTR: 1945 (sort of), and XTR: Royal Fantasy (maybe?), all April 1 and Halloween gag projects written or developed by me are officially considered non-canon, BUT were specially made to be "canon-compatible" as much as possible, so they could be seamlessly integrated into an otherwise above-board campaign. This also applies to my "fan-made" stuff, such as the Reign of the Tetakuni adventure and this Syberia TRO.]
Also, the Illegal Quirk's drawback is right in its name: Illegal. This means that the unit violates extant game rules in some way and thus cannot be canonized as a working game element. At least, not for very long.
- Herb