[Number 4]

It's all about individual circumstances as many here have noted. If I was full timing with a large rig and loved mountains it would be a diesel without question. The DW and I are full timers (work that is) and our TV is a second commute vehicle, we get away to camp 4-5 times a year in our smallish TT and after retiring in 3-4 years we'll camp a lot more but don't plan to haul cross country. I got a smokin' deal from a private party last fall, my TV gets compliments from strangers, it's rock solid and going 55mph uphill is fast enough for me. YMMV.