In the past, pure sine wave inverters were substantially more expensive. Our last DP, 2005 Monaco Diplomat, came with a modified sine wave Magnum inverter. Since then, many of your new coaches are now coming with residential refers. The majority of those refers require pure sine wave. The prices have also come down on pure sine wave inverters or at least the differential between MSW and PSW prices have grown closer together.
I think any coach you see with a residential refer will be PSW and the majority of the others will probably trend toward PSW too.
