OK Jim,
I'm sure you knew I'd chime back in after reviewing your spreadsheet (top to bottom), but I'll try to be succinct and only on things I can answer or have a strong opinion on:
--Maxx Air Fans. After assessing mine, I like these; I haven't personally compared directly to the Fantastic units, but the reviews from many others have been superior.
--Surge Protection. I have the Progressive Dynamics EMS model EMS-HW50C; it's the standard Phoenix install, and I think it's going to work fine based on my review of the unit and the readout information it is providing me.
--Backup Monitor. Phoenix spec sheet said it was a "Sony Monitor". Unit installed in mine turned out to be a Boyo 7-inch monitor manufactured by Vision Tech America. Seems to be OK; yes, it can be run continuously.
--Liquid Springs. Little surprised to see this based on your earlier post where you mentioned looking for ways to save on cost. Pretty pricey option. I have NO basis on which to comment on value; I decided not to include them on mine based on quite a few forum postings extolling the favorable ride on the standard 2552. I am happy with the ride in the thousand miles I have on mine, but that's hardly any type of fair test yet.
--In Dash GPS/Sirius/Bluetooth. I don't like in-dash GPS, but I do like Sirius Radio and hands-free phone capability. I didn't go with their all-in-one unit, but I had them install a less expensive Pioneer 6-inch screen that has Sirius and phone capability. That way they did the factory install on the Sirius roof antenna, and with my Garmin GPS I've got all of the features I want.
--Solar Panel. Again, pretty pricey, but the main advantage here is that it pretty effectively keeps your house batteries automatically topped off if you're parked outside. Obviously depends on usage, etc, but even with our cloudy/wintry skies mine while parked shows at least a constant 2-3 amp charge when it's light (much more in sun), and if I do something to run them down to 90% or so, they come back up to 100% in a few hours and maintain there without my attention, even with the battery switch set to off. If you're plugged into power most of the time when at home and on the road you can certainly do without solar, but in any type of off-power situation they are a pretty big (automatic) help.
--Lagun Tables. Sure like the Lagun tables. I opted for the cabinet set behind the passenger seat primarily to get the fold-up table for a computer work space--before I found out about the Lagun tables. I now have both, and there's no comparison (in my opinion) regarding usability and versatility. I still like the cabinets actually--there is several discreet storage spaces there that I will use, and I didn't need the Eurochair they replaced, but I am using the Lagun tables for all of my sit-down work.
--SeeLevel Gauges. So far I like the SeeLevels; they give me exact % read-out on water, gray, black, propane, and battery; I can see the levels change a percent at a time. Time will tell about reliability--that will be the main issue; I think they're worth the money if they hold up.
--Converter. I was initially concerned about the converter when I assumed that Phoenix was still using the Parallax single stage unit that they had been installing in 2017. My solution was to ask them to install the Progressive Dynamics PD4500 3-stage converter as certain others had done. When I surfaced that issue, I found found that they had already made that change to the PD unit as their standard converter. So far it seems to be working great with my AGM batteries.
--Mirror w/Compass. Didn't buy this $300+ option since you can't see behind the coach with the mirror anyway (and I have a compass heading on my Garmin GPS). I assumed this would mean there would be no rear view mirror at all--but one is installed--just no compass heading in it. I'm fine with that.
--Awning. Believe your listing is the regular awning option for the 2552. My build sheet from Phoenix lists only the 18-foot awning as the option for the 2552 (the 17-foot is listed as the option for the 2551). There is the second option for the wind sensor and remote control.
--Mobile Eye. Both Mobile Eye 5 and 6 series units do offer lane departure warning. I didn't opt for this option up front, since it's something else that can be added on relatively easily if desired. I do have to say that when first piloting the E-450, I was transported back a few years technology-wise. I guess I had gotten used to built-in blind-spot notifications, lane departure, automatic braking, memory seat settings, even multiple cockpit USB connections--all of which were on my last couple of vehicles and none of which were on my new E-450. It was kind of like climbing into the 2005 (or so) vehicle that it really is. It's very capable and adequate, of course, but you''ll notice the difference. Fortunately the aftermarket stuff available (like Mobile Eye), will let one incorporate just about any capability that they really want to add.
There's quite a few other personal-preference items I could comment on, but because they fall in that category you're really the only one that can decide how important they may be to you. I'd certainly try to address anything you had a specific question on, however.
All the best, Mike
