I have 5200 lb axles on my 11200 lb 5er. I use the BFG Commercial 16" LT215/85-16 E at 2680 lbs capacity each. Ran the first set for 55k + miles and over 7 years. I'm on the 2nd set and have had zero issues.
"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers
'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides
iam not sure if i can go with a 85 because my wheels are to close together
Are you having problems with your tires? Keyston does not have a habit of putting so much reserve load capacity in their tires. You should have 1840# reserve load capacity per axel with those tires aired to the sidewall pressures. No reason they should give you any problem.