If it was my truck I would look at the Alternate sizes that offer an LT tire. I ran LT285/55R20 hankooks when I had my F150 (sold to father in law) and they lasted about 75000kms before my father in law changed them out, he’s now running LT275/65R20 Michelin LTX A/T2 tires on it and is a very happy camper.
Many options in alternate sizes in LT configurations, just not the factory 275/55R20. Your truck stock will have zero issues going to a 33-34.5” tall tire with regards to rubbing or really hurting performance but keep in mind that the larger the tire the more effect it will have on your effective gear ratio.
My vote is for the Michelin A/T2 in LT285/55R20, close to your stock size and it’s a very good highway tire that still offers reasonable performance off the beaten path.
