You may want to consider a bunkhouse model with a spacious bedroom for you. The bunkhouse can be the kids space that doesn't have to be setup and torn down every day. With a large enough bedroom, you can set up a "desk" over the dresser area possibly and use that to remain productive.
Some good keystone options that come to mind:
Avalanche 378BH (also available with residential fridge in 379BH)
Montana High Country 364BH (also available with residential fridge in 365BH)
Montana High Country 362RD
All of those are also bath and a half models which will be appreciated I think with 5 people sharing one trailer.
I personally just took home a Grand Design Solitude S-Class 3740BH which is also a nice bath and a half bunkhouse model with a lot of space in the front bedroom also. A family who calls themselves the Wandering Arrows had the same model and full-timed in it until they had to stop for medical reasons and the husband who worked on the road built a nice office setup in the bedroom that may work well for you as well. Here is their tour, the link will jump you to the bedroom where you can see his setup. I know this is a Keystone forum, not saying you have to get a GD, just showing what may be possible with a little tweaking in one of the above mentioned models.
https://youtu.be/2Dc4sf9ucbs?t=705
And yes, get a diesel dually, do not get a smaller truck and compromise your safety or RV choice.