I'm calling on your help here. I took frame off my camper to work on frame and wheels, add shocks and add some gerry can racks and a new bumper. My plan is to change hubs from 4 by 4 - 13" to 5 by 4.5 - 15". I will put on a 28-29" tire. The axle is 2000# Dexter. The shell in the pic weighs about 300-400 lbs. My plan for the camper is forest service type travel. We are prepping for a Baja Cali trip this winter as well. My question is the stress on the axle spindle with those larger tires. Am I silly not to go up in axle strength? 2500# I've been working on this camper for a few years and this is on of my last major projects.