If you're interested enough and want to know how much electrical energy you're actually using daily for a long trip like you're planning, then here's a pretty easy way to estimate it. This assumes that your batteries are new-ish and healthy. You will need a voltmeter.
Start with a fully charged battery, then go camping for a few days using your electrical devices as you normally would, but don't connect any charging sources. Wait until your battery is roughly around 50% discharged as indicated by the little panel lights. Then, disconnect the batteries from everything and let them rest a couple of hours.
Measure the battery voltage and use a table like the one in this article to determine state of charge. For example, at rest a deep cycle lead acid battery should be around 12.0-2.1V when at 50% SOC.
Say you have a 200 amphour GC battery bank and you're at 50% SOC after 2 days. You are consuming about 0.5*200/2= 50 amphours per day. So now you know your consumption rate, at least for the particular conditions you encountered in those 2 days.
Next, say you want to go 6 days before you move camp and can fully recharge you battery from your tow vehicle while moving to your next spot. You will need 50*6=300AH. You will start with 100 useable AH in the battery because you don't want to go below 50% SOC. So, you need to replenish 300-100=200AH in 6 days. You will need 33AH daily on average from your solar system to do that. You'll probably want to also have an alternative backup charging source like a genny or your tow vehicle if you get a run of cloudy days or are camped under trees. You can see that if you plan on moving camp every 2 days you wouldn't really need any soalr charging.
Most places in the summer in north america will get at least 4 hours of full sun equivalent per day on a tilted south facing surface that's unshaded. So, you'll need about 33/4=8.25 amps of solar charging. Solar modules run at about 18V so that's 8.25*18=148 watts of solar.
YMMV.