Tire Margins on 2619

My understanding is that a 2619 ships with Goodyear Marathons ST215/75 R14 tires. That is the size tire on a 2619 that Custom RV brought by our house to try in the garage last weekend. They have a maximum rated load capacity of 1870 lbs at 50 PSI for a total of 3740 LBS. I was wondering if any one can tell me the actual weight on the axle of a fully loaded 2619 with A/C, two full propane tanks, two baterries, full of water and around a week's worth of camping gear. My guess is that there will not be too much margin, but I would be interested in someone who actually weighed their TrailManor.

On another post I thought I saw somene who stated their Trailmanor weighed 3700 lbs, but I don't remember the model number.

I was also wondering if a pair of 15" Goodyear Marathons ST 225/75 R15 could be mounted on a 2619. They have a capacity of 2150/tire at 50 PSI, allowing for some extra margin.