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I quite often have a full dumpy bag in the back of mine, the only issue I have is the sliding cover I have does get in the way, but just have to slide it in a bit. Have thrown 6m drain pipes over the back with a ladder rack but probably not recommended...
My last pickup was an old yellow AA vauxhall Brava which had the body taken off and an aluminum tipper put on, that thing took loads in the back, I did once put 4 full dumpy bags in, I was essentially doing a wheelie all the way home...
Are the l200 posermobiles the 2017 on model? Mine is and the turning circle is much better than earlier models and really quite ok (nb: for a pickup). The loadbay isn't huge, but will easily take a ton bag of aggregate, with a ladder bar behind the cab 5m timbers are about the limit.
If possible, avoid anything with a towbar, you have to assume it's been hauling a ton of Ifor Williams and a 3 ton digger all its life. Particularly avoid anything used for forestry, 20k miles of that and they're fucked.
And never trust a tree surgeon, they only exist to make solicitors look honest.