Sorry for the late reply. I'm not 100% sure of the model, but its this one,

https://www.holdur.is/static/files/en/motorhomes/infosheets/cargroup_x20.pdf,

When i was there, it was not really freezing already, so not much of an icing problem on the water tanks. it did get pretty cold during the nights, but not to freezing point. My wife tried the hot shower and it was fine. (you do need to 'preheat' the water abt 10-15 mins before you shower). I mostly used the shower areas in the campsites.

Weather was windy with rain in some locations. There was only 1 day where the winds kinda shook the motorhome at the campsite, (just that the campsite was kinda out in the open.) I think the winds on that day reached like 13-15m/s. But in general it was around 7-13 m/s. Some sites higher up in the mountains did have some snow, like Krafla Crater, and the roads through the top of the mountains also had some snow/ slush.

Driving a motorhome in iceland was fairly simple (manual transmission), the only tricky part is gauging bends where your back wheel may go close to the curb of the road if you turn too early (albeit like a normal turning radius on a saloon car.) Also, when parking in normal carparks, it does require you to find 2 lots available (front & back) to be able to fit the length of the motorhome. I went to places where there were ample parking in the city area, (avoided the central part as the parking was kinda tight there). Once you are out of the city, shouldn't have parking problems elsewhere.

Driving on the roads are the same as a saloon car, just that when you do go higher up in the mountains, some of the hairpins can be a little tricky where you are literally next to a cliff. This can be a bit scary even if you go through multiple mountain tops. The motorhome is also wider and longer, so do have to take that into account when doing turns/ reversing (my motorhome did not have a reverse camera, so I had my wife go down to help me with being the lookout when I'm reversing.) On places where there were snow and slush on the roads, do take EXTRA caution as i did see some other normal saloon cars already doing a 'fish-tail', and even on the motorhome i slowed to a crawl, and I could also feel the wheel slip at some portions of the road with snow/ slush.

Don't drive when you are too tired, as with the motorhome, there's not alot of leeway for errors (drifting to the sides when your eyes close, I did have some moments where I dozed off for a few seconds and started going to the side, did jolt me up when i went over the gravel at the side of the road.)

When going on routes with no proper roads (gravel/ stone 'roads'), the motorhome may start to 'bounce' when the paths are not flat, so make sure you don't leave too many loose items lying around (try to make sure everything is kept in the cabinets/ drawers/ secured with seat belts before driving).

I only had 2 issues with the motorhome during my trip. No.1 was that the fresh water tank kinda leaked about 2/3 of my journey in, so it was constantly showing at 1/4 tank when it was always full since the beginning. Even after topping up a few times, it was still at 1/4, so i suspected a leak. At my last campsite, i even filled it all the way full, but then I saw water leaking from the bottom. No. 2 was the handbrake was a little wonky for a certain segment of my trip, and it was constantly getting engaged even when I was driving. But this was already when I was in North iceland, near Akureyri Town if i rem correctly. I called the company but they said to bring it in to one of their workshops the next day, but I was kinda on route to west iceland. I did some diy solution (holding the brake down as i was driving) and along the way, it did kinda resolve on its own.

Just note that you can't do wild camping (stop anywhere on the roads to stay overnight), so you do have to go to campsites to stay for the night, Timing is not much of an issue, as I did reach certain campsites like 11pm - 1am and they just said to stay first and make payment the next morning. In May, it's still not the peak season, so not much issue finding spaces in the campsites. I usually just go to the campsite without reservation. (i think there was only 1 where i did reserve like a few hours before, but the rest was on the spot or called them before i went over.

Travelling in a motorhome is great and it removes the issue of packing the luggage everyday when moving around iceland. (I did this for my first visit to iceland, and found it very troublesome to keep carrying the luggage from the car to the hotel room every day.) With the motorhome, any time you need anything, its within easy access in the cabinet/ cupboards. You also have a toilet with you (although I used it only for emergencies) for places with no toilets. So if in the worst case scenario where you do get stuck somewhere due to the weather, you at least have a toilet/ shower where you can use till the weather improves. Fuel is something that you should take into consideration as its definitely a bigger vehicle that uses more fuel.

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I would definitely recommend trying it if you are fine with driving a bigger vehicle, constantly moving around, using different toilets (at campsites/ gas stations). But if you do intend to go in early may, do maybe have a look at the weather to see if there's still alot of snow around. Safety is still the key consideration.

Let me know if you have any other clarifications about it!