Sarah Rossi,
Welcome to the Forums! I hope we can give you some decent advice. I agree with most of what's already been said. I think your price is unrealistic ESPECIALLY at this time. RV prices are sky high right now for whatever reason. For some crazy reason post-Covid people think RV'ing is a cheap way of vacationing. THEY are going to be in for a surprise. I think waiting it out a year could be a good strategy. Use that year to do some real research as to what you and your family need right now. We did our research for 2+ years before we purchased our first and current RV way back in 2004. The combined wisdom (and opinions) of the folks on this forum were instrumental in guiding us to the best solution for our needs. (OK, we started out looking at $12k hybrid trailers to tow behind our minivan and ended up with a 36' gas Class A which we use to TOW our minivan. And we looked at every option in between. But the important thing is that in the end, we found the best rig possible within our budget (though stretched a bit! LOL) and met our requirements. So, doing your research is very important. Buy the right rig the first time.)
You mentioned some chassis requirements first (Cummins & Allison). That's fine, but for most of us, the floorplan is THE most important part of the motorhome. Most people are living in their motorhome far more than they're driving it, so that livability is important. Figure out what floor plan will work for you and your family, THEN find the best RV manufacturer who has something like what you need. THEN see if that's on a chassis that you want.
How many of you will be travelling? What ages? Approximately how long will these trips be in duration? Just weekends, or one or two weeks, I'm guessing. At least until you reach retirement. The larger the rig, generally the more storage that will be available allowing you to pack for longer trips. Also, they typically will have larger holding tanks which allows for longer periods of time between dumping the tanks and refilling the fresh water. If you don't have any experience with RV's, read up a bit on proper water conservation techniques to get the most out of capacity in the tanks. We can usually get about 4-5 days on our tanks, depending upon use and if we go out during the day. But I've read stories of people on these forums that would barely get a day out of the same capacity. There IS a mindset you need to adopt to get the maximum flexibility out of an RV. If you know that going it, it can help you choose what is most important to you. On the other hand, if you're always going to be parked/camped in a location with full hook-ups every night, then it's not really an issue. Again, know how you're going to want to use the rig.
Please note that larger rigs, especially for Class A DPs, however, DO NOT necessary mean they are geared to be home for more people. As was mentioned, a large number of DP's are designed for 2 adults. So check things like seatbelt numbers and locations, sleeping accommodations, storage locations for clothes, shoes, towels, etc. to make sure it can work for you. For example, a lot of rigs now have king sized beds. If you don't need a king size bed, then it's probably going to be a waste of valuable space. We don't have one in our sticks & bricks home, why would I want one in my RV? LOL
And while I'd never say DON'T get a diesel pusher, I think you're doing yourself a disservice by not looking at gas units as well. ESPECIALLY if you're not going to be using it much in the near term and you might be purchasing another unit upon retirement. I would have LOVED to have bought a DP, but that was WAY out of price range once we realized what we needed for floorplan & storage space. To be honest, the Workhorse Chassis on our gasser has been quite reliable. A few recalls had to be done in the first couple of years, but overall it's been a good platform. That said, IF we didn't have the right floor plan on it for our needs, it wouldn't have mattered if it was Workhorse, Ford, Cummins, whatever, as wifey would be miserable. And as they say...."If mommy ain't happy, no one is happy!" LOL
You mentioned safety. In my opinion, the most important aspects of safety are proper & regular maintenance in tandem with a defensive driver who understands the limitations of their vehicle and themselves.
Tell us a bit more of your intended use and hopefully we can give you some more advice.
If you haven't figured it out yet, you have a lot to learn, and we're willing to help you where we can. The one thing I can definitely tell you is NOT to believe anything an RV salesperson might say to you without checking with us first.
😉Good Luck,
~Rick
On edit: Oh...one last thing. You mentioned "reliable". That is a word not too frequently used with RV's. At least not those purchased on a budget. But, IF we ever decide to get another motorhome, my plan would be to purchase a gently used 20-25 year old Prevost or similar rig which probably was $750k or more new. That wouldn't be in your price range, but I think that's a way of hedging the reliability issue. There are compromises in between, of course. But it's knowing what to look for and which manufacturers build the highest quality rigs. Good Luck.
2005 Georgie Boy Cruise Master 3625 DS on a Workhorse W-22
Rick, Gail, 1 girl (27-Angel since 2008), 1 girl (22), 2 boys (23 & 20).
2001 Honda Odyssey, Demco Aluminator tow bar & tow plate, SMI Silent Partner brake controller.