Hey,
You should consider calling GoNorth and talking to them about a quote. 
There are a few ways to save a lot of money with them.  One is the early bird discount, which ends at the end of January for this year (assuming they'll offer it to a new quote, I booked mine back in September of this past year). 
You can also save a lot of money on a trip of that duration by contacting your insurance company and seeing if your auto insurance will cover the vehicle.  Bear in mind they won't just take word of mouth or a basic declaration showing you're insured.  It needs to show in plain text from the company that they'll cover the rental.  This is also something you don't have to have done the day you book.  It just needs to be good to go a bit before the trip.
You can also choose to prepay miles prior to your trip.  My understanding is this can be altered up to the point of when you depart.  You can also then pay for any overage from what you allotted but it is about 10 cents more per mile.  Currently I have 500 miles paid for.  I need to pay for another 500 before I go, which would pay for a single round trip to prudhoe and back but nothing more.  I'd rather eat the extra 10 cents per mile on a bit of back and forth than prepay 200 extra miles or go unlimited.  
My booking pre-additional 500 miles is just under 1000.  Add an additional 165 dollars(ish) for the extra 500 before I depart. 
So for simplicity, I'll have 1165 in the game for GoNorth for 10 days compared to U-Haul...
Uhaul, for simplicity, a small 10ft enclosed truck is 20/day.  So 200, then .79 cents a mile.  At a minimum 1000 miles.  That's 790 dollars.  So 990.  And... Uhaul in Fairbanks said if you take it on the road, liability is on you.  No insurance.
So.. 990 before taxes and fees vs 1165 and I'm covered and a nice truck that isn't a uhaul?  And less stress?  No brainer for the little bit of extra legwork and cash.
U-Haul has intentionally been laying the dick to customers in Alaska from what I've gathered.  They told me back in August of 21 that they were on a day by day rental, aka... you book for 10, they can at their discretion reduce your rental time to one day.  That's directly from them, not third party.  When they wouldn't guarantee a rental for 10 days straight no questions in 2022, I walked away.  Not worth the risk. 
Goodluck