Toddler transport (cart?) for festival help please

[Citybaby]

Hello, I'm going to my first festival with my 3 year old and 2 year old DD's next weekend and can't work out how to cart them about. Do you use a cart or double buggy or what? They can both walk really well but do get tired, but if I bring my usual single pram I just know they'll fight over it as soon as they get tired!

The requirements are:
Collapsible to fit in small boot
Room for 2 to nap

I've found these but I just can't seem to make up my mind, help!
www.amazon.co.uk/Kampa-Trucker-Trolley/dp/B00IF61YHO?ie=UTF8&ref_=pd_cp_sg_0&tag=mumsnetforum-21

www.ebay.co.uk/itm/Foldable-pull-along-wagon-with-roof-garden-trailer-hand-cart-transport-trolley/272274024989?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D36886%26meid%3D6a4e8f5eac74436d89b2778ce3d70847%26pid%3D100033%26rk%3D1%26rkt%3D8%26sd%3D331637184376

www.argos.co.uk/static/Product/partNumber/4442396.htm?CMPID=GS001&_$ja=tsid:59156%7Ccid:189949525%7Cagid:18074417725%7Ctid:aud-158518126633:pla-135344156485%7Ccrid:77627774245%7Cnw:g%7Crnd:13347801603329743718%7Cdvc:t%7Cadp:1o2&gclid=CIbG09GX0M0CFdUy0wodF1oOyw

Thank you!

At that age and size it'll be easier if you used a buggy. The trolleys are awkward and the ones you've linked don't look very large for two.
Could you borrow a double buggy? It would make your life so much easier.
We managed to fold our 6 year old into her ancient Maclaren at night time. One evening she was fast asleep with a 5 year old on top! Both slept because they were shattered.
We cracked last year and hired a trolley. I was large and needed two of us to get it up the killer hill. Child loved it and slept well but it was a chore.

Thank you Silver. Good thoughts, I'll ask around for a compact double. It's quite a small festival (so no hills!) but don't want to make life harder for myself.

If anyone can link to smaller carts that would be great too.

We have this one:
www.amazon.co.uk/gp/aw/d/B007AEFVGC/ref=mp_s_a_1_3?ie=UTF8&qid=1467887902&sr=8-3&pi=SY200_QL40&keywords=festival+cart&dpPl=1&dpID=51ERs0g0tBL&ref=plSrch

It comes to pieces to go in the car (we don't bother with the roof but take a big umbrella).

I love having a cart,I find them a lot easier than a buggy round a festival. We start off with the kids walking and all our stuff in the cart, as the kids get tired we carry our bags and the go in the cart. I like than they can have a proper sleep while we wander about.

I like the look of the carts with and extra bag attached, I could imagine that being useful.