I would lean towards a higher quality 1990's class A, maybe even a diesel pusher if you could get it in and out, they tend to have much larger cargo capacity and larger holding tanks. Typically 100-120 gallon fresh water tank and 40-60 gallon black and gray tanks which should allow for cooking, showering and toilet use by one person for a couple of weeks at a time. Driving it out to dump and refill once every couple of weeks should keep the mechanical stuff in fair to good shape. Personally I would consider a 1990's Safari brand as they tend to have nice all wood cabinet work, if built in the late 90's will have solid surface countertops, as well as Fiberglass roof and Aluminum sides with full body paint. For the internet these days do a wifi link, with a pair of directional antennas, no need to trench in cat5, I am typing this message over a half mile long wifi repeater link through mixed vegetation and get fast enough speed to stream netflix. There are some great bargins out there on 1990's diesel pushers with iffy engines, that would likely be fine for 10-20 miles back and forth, but not up to cross country driving (oil blowby, etc.)
Perhaps something like this, just perhaps for less money and not in as good of shape https://www.rvtrader.com/listing/1995-Safari-SAHARA-35--5001330433
https://www.rvtrader.com/listing/1995-Safari-SAHARA-35--5001330433or
https://www.rvtrader.com/listing/1990-Safari-SERENGETI-5001079314
