I've hunted the Mt Spokane North 2 of the last 3 years (daughter's youth cow moose tag & father's bull moose tag). In terms of lodging both times we camped at Sedlmayers Spirit Lake Resort. Once via tent and the second trip took the RV. Many resorts are closed down that time of year but with this resort they run a restaurant year around, so I was able to camp affordably. I was even able to keep my RV on site instead of hauling it back and forth across the state while I had to work in between hunting trips.
In terms of where to hunt, I agree the go to is to get the IEP pass and hunt both sides of Blanchard Hump and as another said, be sure to have a UTV or ATV available if Inland Empire closes the access gates. In terms of moose numbers, both hunts proved to be more difficult than other OIL hunts I've been on. The moose numbers are down considerably so in my opinion, the first bull moose you see that is at or near 40", I would seriously consider not passing it up. In the end, both my daughter and my dad filled their tags and my Dad's bull was right at 48" but it took a lot of time, commitment and help from others to make it all come together.
Best of luck on your hunt.