It would be a bit of a hassle, but you could replace the two switches with momentary lighted switches and use a relay to turn on the pump. That way you could turn the pump on or off from either place and the light on the switches would indicate whether the pump was on or off (like the new multiplex RV systems).
You could also wire them like a home 3-way circuit using double pole switches, but without indicator lights at each switch, you would never really know if you just turned it on or if you just turned it off.
Brad & Dory - Lone Tree, CO
CURRENT - 2013 Itasca Meridian 42E/2013 Wrangler 4dr Sahara
SOLD - 2014 Redwood 36RL/2014 F350 DRW