Hi Andy,
So we dabbled in renting for a very short period of time.
First thing I would say, be careful of being snake oiled by the sales staff. They will tell you there is no concern etc, the rent will cover everything and it is all bright and rosy. Well below is my experience
We were very fortunate that we paid for our new static outright so had no loan that needed covering. When we initial bought we had one child who was not at school for another year. We also bought about 4 months before all the lockdown shenanigans started. When things opened up we did get bookings for what was left of that season. Now these raised us a substantial amount of cash which easily covered the next years site fees and any maintenance costs (remember we had no capital costs to cover).
That is not the full story though. As FHB mentions, it started to be come a bit of a chore, packing up completely, making sure nothing was left out, no personal touches in the van.
Also we had damage, there are photos of that in another thread on this site. We had the back of our dining table seat ripped off the wall and an arm rest of the main sofa fell off. What pushed us over was the smell of wee in my daughters bedroom after one booking. The cleaners, provided by the site, must of had no sense of smell as it was overwhelming as soon as you went into the room.
When I approached the site, they just don't care. Gone was the seeming genuine care they had when we first bought. They now leave everything up to you to sort out, repair through insurers and in my case start cleaning mattresses with a mini vax unit when I should of been enjoying my time down in the van. Was causing me a lot of stress and anxiety.
So we pulled out of the rental scheme at the end of that year. The decision wasn't a hard one. Also our daughter just started school the following year so we need the school holiday time for ourselves. Park Dean, who's park I am on, want a minimum of 10 weeks a year, 6 of those have to be in school hols and 3 of those in the summer school hols. That just doesn't work for us. We are here every opportunity we can get. I am actually here now working for 2 weeks which will take our time down here over the summer hols to 5 out of 8 in the end.
Don't get me wrong, there are a lot of people who get on with the rental scheme. Some have more than one van on the site. But for us, we were not comfortable and we are fortunate enough to not have to rely on it. We are much happier now we know that the van is secure and waiting for us when ever we want it. We do rent it out to friends and family only and that covers some of the bills. We have personal touches up around the place as well so now it does feel much more like a home from home (although surfboard storage is becoming and issue

). If you need to rely on the rental to cover the cost then I would say the risk is too big. Especially in this world of forced lock downs. A few have become unstuck by this.
So my to round up my advice. If you can't afford everything without the rental income then don't do it. If you do go ahead don't get too attached or make it overly homely, it will not last.
I hope that hasn't put you off buying a static. Other than our little renting blip we genuinely think it has been one of the best purchases especially with a young family. We have another child just about to turn 2, him combined with our 5 y/o daughter, they absolutely love the place and can't wait to be here at every opportunity.
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