Get good internet. I found Verizon to be the best for cellular and this was before Starlink Mobile was available. Get a directional cellular antenna and mount (not a repeater/amplifier) and learn how to point the antenna at towers if you plan to do any “boondocking” out in the west of the US. Otherwise, everywhere else these days likely has internet.
Compost Toilet is a win in my book. Very little maintenance and no nasty tanks to deal with. But, it’s not for everyone.
Decide if you need showers in your wheeled home or not. That drives the cost of your rig significantly. Most RVs are absolute trash for quality south of $50k.