I personally almost never use tanks myself, I especially don't find myself using RP to get them. I find paratroopers and strikes much more reliable / straightforward, but to each on their own of course, glad people are ending up in different solutions.
I think what you need to do is to call 8-man paratroopers at the Hotel. Chances are the enemy has a radio tower there blocking the calls, so you'd probably need to get yourself an MP5, a couple of vests and C4, sneak behind the hotel and destroy the radio tower first. Then, call in 2-3 8x paratroopers and run over the base.
It is possible the Hotel is once again bugged in a way the organized attacks from the AI aren't getting launched properly, it has happened at some point. The attacks should be originating somewhere between West farm and Hotel, you should see lots of your troops summoned there and launching waves periodically. You could share your savegame so we could try it too. You'd find the savegame files at %appdata%\Running with rifles\savegames\[yoursavegamename].save folder.
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This game seems to stalemate pretty often, which is the only thing I don't like about it.
Playing with "Less hard" should mean less stalemates too. In my own runs, mostly it's Moorland Trenches and Bootleg Islands that go stalemate a bit, so that I
need to backdoor at least in 2/8 maps, and personally I like it that way. Just running through all the maps wouldn't be what I'd call Hard myself. 4 days in a map obviously sounds off, the hardest time I've ever had in Moorland Trenches is around 3 hours.
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I see so many of them clustered in bases away from combat, doing nothing, while the enemy AI is very smart. It took me having to use a tank in most battles to win a territory.
The enemy AI is same as friendly AI, with the exception that the enemy concentrates on defense even more than the friendly AI. Friendly forces are in the bases away from battle for defense, you wouldn't want your far away bases defenseless as the enemy might backdoor then too easily (similarly, you could backdoor the enemy too way too easily, same logic applies both ways).