I have a friction rowing machine.
I love treadmills but they take up too much room in my rig.
My rig: 16'ft cab-over box truck with GMC Sonoma small truck toad.
The plan is to wheel the rowing machine out at camp and set it on the ground in inclement weather. Hard cardio every day. Its work, harder than the treadmill to inspire, Led Zepplin required.
I also will have the stationary bike stand allowing me to ride in place. Small footprint and the bicycle is non-negotiable.
Also a foldable, top-quality kayak and dumbells.
I can see the rowing machine being discarded eventually.
My goals: 2 hr's exercise p/d min.
Boondocking.
Solo.