OP, going with a cassette toilet doesn't mean you can't have a shower as well. Outfitter, Northstar and hallmark all have such setups.
To be clear I and others are talking about this.


and not this when we say cassette toilet.

Something like the
Outfitter Apex8 should work well for your needs with its relatively lightweight construction and the lower height from the pop-up roof allowing easier navigation of overgrown roads into campsites. It is a fully equipped camper with all the amenities of any hardside but in a more compact travel package.