Traveler II
Overlanding with mixed groups (4x4 and motorcycle) is certainly possible, but more difficult than you think. For example, the motorcycle is much more agile and faster on any terrain vs the 4x4. My KTM 500 EXC can ride Single track, and Dual-Sport rides, and do both very well. Given that fact, it will eat up any Overland roads very quickly, and handle the rougher terrain more easily, thus allowing the bike to cover more ground than a 4x4. Given that most bikes have between 8 and 12" of travel, they are just more capable off-road. But, as others have noted, the rider must choose wisely what they are taking, and most often, it's the bare essentials. My recovery gear for the Dual-sport riding is a 100' static-line rope and some pulleys, tire patching kits and a few tools. Most of what the rider has on their bike is the tent, food, water and some cooking gear. Whereas, the 4x4 has the drone, large DSLR camera kit, Dometic fridge, RTT, etc. Quit simple, with all that gear, the 4x4 can't travel as fast as the bike, and generally only has about 5 to 8" of travel, limiting the amount of abuse the 4x4 can handle without being shaken to pieces.
So, to answer the question of mixed groups, yes, it's possible. But, the bike rider certainly doesn't want to be the tail-gunner breathing in that dust of hermetically sealed 4x4 rig, so they tend to pull ahead, and most times, they are able to get w-a-y ahead, given their capability.
Yeah, it's possible, but not practical for either group.
I'm currently working on rebuilding a 2004 KTM 950 from the ground up, that I hope to have completed in the near decade.
I've had some success but using pre-determined waypoints and meeting places to verify everyone has reached destination at the pace required. It is also kind of nice those on the bikes can scout good camp ground or even scout ahead on trails not yet traveled. If someone on a bike does require assistance a support rig is not far behind.