With future longer trips in mind I'd start from the ground up.
Good quality tires. Upgrade springs, I went from 6 leaf to 7 leaf stack. Wet bolts. Correct Track system for alignment. Reinforce/upgrade springhanger area. Carry at least 1 spare brake plate & drum with new bearing. One of the better air bag pinboxes would be much appreciated by your backs.
If you are planning something like an Alaskan trip upgrading in advance is much cheaper than repairs if something breaks on the way.
Upgrade the electrical system. Can't have too much battery power. A pair of group 24 batterys are virtually useless. Amps are amps no matter how you get them. A pair of group 31s, a pair of 6V GC batterys, or a single 12V 4D battery are all going to give a similar amp availability.
A pure sinewave inverter of 1000W minimum will run everything except A/C & microwave. Get a 2000W inverter genny. Solar power will depend on how you like to camp.
If you are a camper who prefers to be in the shade solar power is not much use to you. Of course it does not work at night no matter where you are. You can buy an awful lot of gas to feed the genny for the price of a solar system.
To us, washers & dryers come under the heading of 'fluffy stuff'. Our washer dryer cabinet is in the galley area so it was converted into a huge pantry/ cupboard. Once every couple of weeks we hit a laundry, load up at least 3 machines & in less than a few hours everything is done & put away.
