Everything in Montana is going to be packed solid. Glacier Park has gone to a reservation system for admittance. You will have to be lucky to find any space to park your RV, with our without hookups and boondocking outside of designated camping spots is not allowed. And this is not taking into account any Canadians that would flood across the border should the travel restrictions be removed. If you don't already have reservations, this might not be the best year to travel to Montana.
On another note, businesses in Montana are DESPERATE for employees. Many businesses have had to cut back on hours and services because they simply cannot find employees at virtually any wage. This has led to current employees having to take on more responsibilities and working longer hours. Patience in service oriented businesses is running low, so please give the employees a break.