I brought my new 5er home from the factory last year, 1300 miles. Parked it in the driveway, jacked it up and replaced all of the factory OEMs.
I am retired, but transport a dozen or so RVs from Indiana to Denver every year for a local dealer. 3 years ago I was transporting a high-end 5er and had a brand new tire delaminate less than 200 miles from the factory. It cost me my $1000 deductible and actually did almost $2500 worth of damage ripping up the side of the trailer.
I always tow with the proper air pressure(max) and never over 65mph. Even so...., Every trip with factory OEMs is the RV version of Russian roulette.
I paid a lot of money for my 5er and figured the price of upgrading the tires into the purchase price. For me, preventive maintenance has always been easier and cheaper than repairs. That made the decision very easy for me.
It's your trailer, it's your insurance and it's your peace of mind.
Best of luck with whatever you decide.
Ken