Radrover owners have put anywhere from 2.5" to 4.8" tires on the existing Radrover rims. Not sure about going tubeless and what is needed to convert. I just use Kenda 26X3.5-4.0" fat tire tubes with Schrader valves, Amazon, $20. I just see the inner tube as an added layer of protection and easier to fix a server flat with a tube. I did on one occasion run over some glass at 5:30am on my work commute that put a 1/8" slit in the rear tire, Mr. Tuffy liner, and tube. The slit on the tire was too big for Stans to seal; but, a patch kit on the tube and few pumps of air got me on my way.
It really depends on your mix of urban, hard-packed trail, single track, mud/sand/rocks/inclines, and weather for the right tires for the job. For me, I would lean more towards the Maxxis if I was +95% paved roads/trails in an urban environment and 5% or less dry weather hard-packed trails. Once you air up any fat tire to +20 PSI, only about 2-2.5" of the center tread is making contact with the road anyways. The Maxxis is perfect for a fast and comfortable ride with (waaaaay) less noise and better traction than the Kenda.
I'm about 60%-70% urban with hard-packed to single track trails with occasional sandy/rocky/muddy with steep inclines around 5% of the time at 200-225 miles a month. The 120 tpi Vee8 are much better for my riding because they give me:
- less road noise
- longer tread wear
- lighter tire
- more knobs to lessen flats (all of my Kenda punctures were between the spaced out knobs, the Vee8 have a lot more knobs for added protection)
- no tools needed to seat/unseat the tires because they are 120 tpi (can be a pain sometimes because the tire is so floppy with a folding bead)
I usually set the PSI to 20-22 for commuting and I can drop it down to 12-17 PSI for 100% trail riding days. Even at 20 PSI, the Vee8 can still traverse the occasional spots of mud/sand/rocks and make you own trail situations with ease on a trail that would stop a thinner tire (less dig in and more float compared to a thinner tire). The Vee8 is like a year round all season "jack of all trades, master of none" car tire.
The other day on a slight detour riding home after work. I was riding the single track trails near the Rio Grande river and a tree fell overnight across the path. I just made my own path with the Vee8 tires around the soft sandy terrain around the fallen tree without missing a beat.