these are PHEVs, so the battery packs are not as large. I took a look at Tank 500 numbers and the pure ICE version seems to have similar curb weight as the PHEV version.Not about power. EV’s are heavier due to their batteries -> greater chance of getting stuck in the mud.
Also, we have seen Bao-5 in some really off-road challenges and they perform better than all the petro cars.