33' is a ton of trailer for "boondocking". I have a 30' (really 31' tip to bumper, so I am just 2-feet shy of the 33'). Airstreams are super low to the ground. Great for towing on pavement. Not so great for off-road use at this length - the break-over angles are horrible. With the 33' you will need to more or less stay on gravel roads bottom line and you need get a 2 7/8" Dexter lift installed, even if you stay on pavement IMO.
$5000 of lithium batteries (400amp hour) and $4000 in solar (plus install labor) will solve your energy issues for boondocking in the 33 classic, but you still won't be able to run your air conditioners off grid very long with $5k of batts (1-2 hours).
For that, you will also want a generator - and if you are really going to spend that much time (up to 150 days per year off grid) you will want a big generator to run your air conditioners non-stop during the day in hot months if you want to sit comfortably in your office and work in a 72 degree climate. At that point I'm not sure I'd bother with $10-$20k of lithium, solar, electrical upgrades and labor if you are going to be cranking on a genset anyways when its hot out.
But then again, you may get tired if listening to an obnoxious 4-5kw geneset running 24/7 outside of the trailer [emoji4]
Water will be your next constraint for boondocking once you solve the power issue. 54 gallons can go fast [emoji4]
You need a 3/4 ton or better truck for that trailer.
If you'd like more details in the ultimate "work from the road in comfort" boondocking solution here is my system install on my 30'. This install is in the $25-$30k range before you apply solar tax credits which are unfortunately being phased out.
GMFL on the forum also has a large install on his 30’... he is an installer in Alabama. If you are serious about making a large investment I’d give him a shout.
https://www.airforums.com/forums/f53...um-182406.html
Honestly I'd probably start with a $2,000 big generator and evaluate your power usage needs first. You can always sell the genset later if you do a large energy system upgrade.