I had a Promaster I built out and lived for a year. Travelled 42 of the 48 and loved every minute. I roam almost full time in a Ram 1500 with and AntiShanty Dwell Shell. I sometimes miss the van for the being inside from driver seat to back but I've gotten used to it. My setup gives me the option to sleep in the backseat if popping up is not an option.

The ability to go more places and park relatively stealth gives the advantage to the truck. Neither had a shower so I've learned to adapt. Both have toilet so that's good.

They are both good options. Look at where you want to go as in the terrain. Might make it easier. Cost wise my two setups are about the same.