I’m gona add to the confusion lol. #1 you can’t go wrong with the info @Cuoutdoors has about LT tires, that’s why I went that route. Now for confusion central. Well not really. So I’ve had 15” wheels (non beadlocks) when I had my Motoclaws and stuck with 15’s (beadlocks) when I went to my 30” Lt tires. Now the difference in ride was amazing. The LT tires ride way softer than UTV tires. Combined with fox shocks now with different springs it’s even better. I love my 15”wheels. Now I confused you lol.
Ok, as for your lift and spacers. I had a lift like yours and yes, you will want some. I ended up for the ride and the look, I went with 2” in the back and 1-1/2” in the front. Otherwise you look pigeon toed lol.
You can keep your stock shocks and just put 2” spacers on it to help with the clearance with your 28’s (that’s what I did before I switched to the lift, then removed the lift and went to SATV arms) confusion again! Sorry. The spacers for your stock shocks is the cheapest easy lift to do for starters and will help your ride a bit and u can get by without spacers if you like.