We have been searching for our next towable (5er or TT) and after a couple of years we started looking at Class A rigs, although we have always thought why deal with a motorized RV when we already have a great tow vehicle. A year of searching viewing over 50 Class A rigs both diesel and gas, we finally found a creampuff Monaco with under 20K miles in TX, we drove over last summer when the pandemic was raging to get it.
Class A diesels did drive better overall with less sway, having the bed directly over the engine and step up hump in our bedroom was something the DW did not care for. After driving many Class A gassers, we found Monaco rigs were quieter and handled well at interstate speeds, particularly the workhorse chassis version. Our Monaco has 8.1L, with W24 chassis, and 5 speed Allison 2100 tranny.
Owners were great allowing us to spend 3 nights in it before deciding, drove it home through record breaking 110+ degree TX heat without a hitch. Only reason for selling was the husband was hoping to still use it, but at 84 years old his 75 year old DW told him it is just sitting and should be enjoyed by somebody, some of their best life memories were derived from their coach.
Do as much research as possible and drive as many rigs as you can to get a feel for what is important to you and your DW. I have always done all my own work on our RVs, repairing and modifying our rigs to meet our needs. We have put over 8K miles since last July, although we live in the mountain west it does very well climbing the steep inclines we encounter. I love that it is very easy to perform maintenance and parts are readily available.