Yep, thought that was you, PT. You must be haulin' watermelons or something back there! Or does it have a really short wheelbase?
Suspecting it was you, I looked at Michelin's tire pressure chart for larger size 16's than Class C's usually have. You're at max for the rear and yes, the front pressure comes up 45 for the weights you furnished.
I'd suspect that the ride at 45-PSI might make your front end tracking a little wobbly. I can promise you that MORE pressure than the front axle weight calls for is Not Good on a Ford E-Series chassis 1992 or newer. GawRonTeed. That said, we headed out into cool (relatively speaking, summer in Georgia mountains instead of Florida...) and that effectively lowered our front tire pressure. I aired up to the chart requirements, and tracking was much better driving home than it was on the way up.
So, what I'm now suggesting is get the front tire pressure within 5-PSI of what the chart wants. You're showing 45 on the chart...try 50.